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Eggs

45 eggs at true relative size, from the 31 mm egg of the Least Bittern to the 91.3 mm egg of the American Flamingo.

About this collection. 4,422 eggs, covering nearly every bird that nests in the Americas, from Canada and the United States through Mexico, Central America and the Caribbean to South America, plus a few famous eggs from elsewhere, like the Ostrich and the extinct Elephant Bird. Sizes come from published measurements wherever we found them; shapes and colours are our best estimates (how accurate these eggs are).

2,116 of them are marked Speculative: we haven't found documented descriptions or measurements of these eggs yet (for 129 of them, a source we checked reports the egg as undescribed), so they are estimated from their closest relatives. They are hidden unless you untick Hide speculative eggs. We keep adding sources and update the eggs as we go. Have you seen one of these eggs, or know a source? Message us.

Make a poster of these 45 eggs
Illustration of an American Flamingo (Phoenicopterus ruber) egg, 91.3 × 55.4 mm Illustration of a Chilean Flamingo (Phoenicopterus chilensis) egg, 91.3 × 54.2 mm Illustration of an Andean Flamingo (Phoenicoparrus andinus) egg, 84.7 × 54.3 mm Illustration of a James's Flamingo (Phoenicoparrus jamesi) egg, 82.8 × 51.1 mm Illustration of a Jabiru (Jabiru mycteria) egg, 78.4 × 58.3 mm Illustration of a Maguari Stork (Ciconia maguari) egg, 75.8 × 52.7 mm Illustration of a Sharp-tailed Ibis (Cercibis oxycerca) egg, 69 × 47 mm Illustration of a Black-faced Ibis (Theristicus melanopis) egg, 68 × 44.3 mm Illustration of a Wood Stork (Mycteria americana) egg, 67.9 × 46 mm Illustration of an Andean Ibis (Theristicus branickii) egg, 67.7 × 43.1 mm Illustration of a Plumbeous Ibis (Theristicus caerulescens) egg, 67.7 × 43.1 mm Illustration of a Cocoi Heron (Ardea cocoi) egg, 65.4 × 46.5 mm Illustration of a Roseate Spoonbill (Platalea ajaja) egg, 65 × 43.9 mm Illustration of a Great Blue Heron (Ardea herodias) egg, 64.5 × 45.2 mm Illustration of a Buff-necked Ibis (Theristicus caudatus) egg, 64 × 43 mm Illustration of a Rufescent Tiger Heron (Tigrisoma lineatum) egg, 59.75 × 44.95 mm Illustration of a Fasciated Tiger Heron (Tigrisoma fasciatum) egg, 58.5 × 44.7 mm Illustration of a White Ibis (Eudocimus albus) egg, 57.6 × 38.3 mm Illustration of a Bare-throated Tiger Heron (Tigrisoma mexicanum) egg, 57.35 × 44.4 mm Illustration of a Great Egret (Ardea alba) egg, 56.5 × 40.5 mm Illustration of a Scarlet Ibis (Eudocimus ruber) egg, 56.03 × 37.06 mm Illustration of a Green Ibis (Mesembrinibis cayennensis) egg, 54.6 × 38.6 mm Illustration of an Agami Heron (Agamia agami) egg, 52.13 × 37.2 mm Illustration of a Glossy Ibis (Plegadis falcinellus) egg, 52.1 × 36.9 mm Illustration of a Puna Ibis (Plegadis ridgwayi) egg, 52 × 35.4 mm Illustration of a Pinnated Bittern (Botaurus pinnatus) egg, 51.8 × 40.5 mm Illustration of a Black-crowned Night-Heron (Nycticorax nycticorax) egg, 51.5 × 37 mm Illustration of a White-faced Ibis (Plegadis chihi) egg, 51.5 × 36 mm Illustration of a Yellow-crowned Night-Heron (Nyctanassa violacea) egg, 51.3 × 36.9 mm Illustration of a Reddish Egret (Egretta rufescens) egg, 51 × 37.6 mm Illustration of a Boat-billed Heron (Cochlearius cochlearius) egg, 50.25 × 35.25 mm Illustration of a Capped Heron (Pilherodius pileatus) egg, 49.4 × 36.5 mm Illustration of a Zigzag Heron (Zebrilus undulatus) egg, 49.4 × 36.5 mm Illustration of an American Bittern (Botaurus lentiginosus) egg, 48.6 × 36.6 mm Illustration of a Bare-faced Ibis (Phimosus infuscatus) egg, 47.4 × 34.6 mm Illustration of a Whistling Heron (Syrigma sibilatrix) egg, 46.3 × 36.5 mm Illustration of a Little Egret (Egretta garzetta) egg, 46.2 × 33.5 mm Illustration of a Cattle Egret (Ardea ibis) egg, 45.56 × 32.22 mm Illustration of a Tricolored Heron (Egretta tricolor) egg, 44.1 × 32.3 mm Illustration of a Little Blue Heron (Egretta caerulea) egg, 44 × 33.5 mm Illustration of a Snowy Egret (Egretta thula) egg, 43 × 32.4 mm Illustration of a Green Heron (Butorides virescens) egg, 38 × 29.5 mm Illustration of a Striated Heron (Butorides striata) egg, 37.6 × 27.8 mm Illustration of a Stripe-backed Bittern (Botaurus involucris) egg, 33.2 × 25.6 mm Illustration of a Least Bittern (Ixobrychus exilis) egg, 31 × 23.5 mm
All 45 eggs at the same scale, largest first. Tap an egg to jump to it.
Illustration of an Agami Heron (Agamia agami) egg, 52.13 × 37.2 mm

Agami Heron

Agamia agami

  • 52.13 × 37.2 mm
Breeds in Mexico, Central America (7 countries) and South America (9 countries)
show all 17Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
South America: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

Very pale dull glaucous-blue, unmarked; subelliptical.

Sources of information

Size
Wetmore, A. 1965. The birds of the Republic of Panamá, part 1 (Tinamidae to Rynchopidae). Smithsonian Miscellaneous Collections 150(1)., p. 97.
Description
Wetmore 1965, The Birds of the Republic of Panamá, Part 1 (Smithsonian Misc. Coll. 150).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of an American Bittern (Botaurus lentiginosus) egg, 48.6 × 36.6 mm

American Bittern

Botaurus lentiginosus

  • 48.6 × 36.6 mm
  • Clutch: 2–7 eggs
Breeds in Canada, United States, Mexico

Beige-brown to olive; unmarked.

Sources of information

Size
Average of 43 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 76.
Description
Cornell Lab of Ornithology, All About Birds: American Bittern, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (Royal Saskatchewan Museum).
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of an American Flamingo (Phoenicopterus ruber) egg, 91.3 × 55.4 mm

American Flamingo

Phoenicopterus ruber

  • 91.3 × 55.4 mm
  • Clutch: 1–2 eggs
Breeds in Mexico, Bonaire, Sint Eustatius and Saba, Caribbean islands, Brazil, Colombia, Ecuador, Venezuela

White.

Sources of information

Size
Average of 41 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 6.
Description
Cornell Lab of Ornithology, All About Birds: American Flamingo, Life History.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of an Andean Flamingo (Phoenicoparrus andinus) egg, 84.7 × 54.3 mm

Andean Flamingo

Phoenicoparrus andinus

  • 84.7 × 54.3 mm
  • Clutch: 1 egg
Breeds in Argentina, Bolivia, Chile

Elliptical, white, unmarked, with a chalky coat.

Sources of information

Size
Average of 13 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 2, p. 9.
Description
de la Peña 2025 (Aves Argentinas tomo 2).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of an Andean Ibis (Theristicus branickii) egg, 67.7 × 43.1 mm

Andean Ibis

Theristicus branickii

  • 67.7 × 43.1 mm (estimated)
  • Speculative: we haven't found a documented description of this egg yet, so we estimated its colours and markings and its size from related birds.
Breeds in Bolivia, Ecuador, Peru

No documented description found yet; drawn like the Plumbeous Ibis egg (same genus).

Sources of information

Size
Estimated, no measurements found: the median length and width of measured eggs of the same genus: Theristicus caerulescens, Theristicus caudatus, Theristicus melanopis.
Description
Estimated, no description found: drawn like a related egg (Plumbeous Ibis).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Bare-faced Ibis (Phimosus infuscatus) egg, 47.4 × 34.6 mm

Bare-faced Ibis

Phimosus infuscatus

  • 47.4 × 34.6 mm
  • Clutch: 3 eggs
Breeds in Argentina, Bolivia, Brazil, Colombia, Ecuador, Paraguay, Uruguay, Venezuela

Pale blue, unmarked, rather dull.

Sources of information

Size
Average of 27 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 6, p. 259.
Description
de la Peña 2025 (Aves Argentinas tomo 6).
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 6, p. 259.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Bare-throated Tiger Heron (Tigrisoma mexicanum) egg, 57.35 × 44.4 mm

Bare-throated Tiger Heron

Tigrisoma mexicanum

  • 57.35 × 44.4 mm
  • Clutch: 2–3 eggs
Breeds in Mexico, Central America (7 countries) and South America (2 countries)
show all 10Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
South America: Colombia, Peru

Very pale glaucous-green, sparingly and indistinctly dotted pinkish buff; others say unspotted dull white with greenish tinge.

Sources of information

Size
Wetmore, A. 1965. The birds of the Republic of Panamá, part 1 (Tinamidae to Rynchopidae). Smithsonian Miscellaneous Collections 150(1)., p. 106.
Description
Wetmore, A. 1965. The Birds of the Republic of Panamá, Part 1. Smithsonian Misc. Coll. 150(1).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Black-crowned Night-Heron (Nycticorax nycticorax) egg, 51.5 × 37 mm

Black-crowned Night-Heron

Nycticorax nycticorax

  • 51.5 × 37 mm
  • Clutch: 3–5 eggs
Breeds in Canada and United States, Mexico, Central America (7 countries), the Caribbean and South America (14 countries)
show all 27Canada & United States: Canada, United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Greenish-blue.

Sources of information

Size
Average of 48 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 203.
Agrees with: Cornell Lab of Ornithology, All About Birds: Black-crowned Night-Heron, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Black-crowned Night-Heron, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (Royal Saskatchewan Museum).
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Black-faced Ibis (Theristicus melanopis) egg, 68 × 44.3 mm

Black-faced Ibis

Theristicus melanopis

  • 68 × 44.3 mm
Breeds in Argentina, Chile, Peru

Greyish white to reddish grey with fine violet and blackish-brown dots and worm- and hair-lines, crowded at the blunt end.

Sources of information

Size
Average of 30 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 2. Akademie-Verlag, Berlin., p. 107.
Description
Nehrkorn 1899 (Katalog der Eiersammlung).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Boat-billed Heron (Cochlearius cochlearius) egg, 50.25 × 35.25 mm

Boat-billed Heron

Cochlearius cochlearius

  • 50.25 × 35.25 mm
  • Clutch: 2–4 eggs
Breeds in Mexico, Central America (7 countries), Trinidad and Tobago and South America (11 countries)
show all 20Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Trinidad and Tobago
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Venezuela

Pale bluish white (greyish-greenish in collections), lightly speckled with cinnamon in a faint ring near the blunt end, often almost unmarked.

Sources of information

Size
Average of 50 eggs: Hellebrekers, W. Ph. J. 1942. Revision of the Penard oölogical collection from Surinam. Zoologische Mededelingen 24: 240-275, p. 243.
Description
Hauber, Bates & Becker (eds.) 2014, The Book of Eggs (Univ. Chicago Press), p. 119; supporting: Hellebrekers 1942, Revision of the Penard oölogical collection from Surinam (Zool. Meded. 24).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Buff-necked Ibis (Theristicus caudatus) egg, 64 × 43 mm

Buff-necked Ibis

Theristicus caudatus

  • 64 × 43 mm (approx.)
  • Clutch: 2–4 eggs
Breeds in Argentina, Bolivia, Brazil, Colombia, Guyana, Paraguay, Uruguay, Venezuela

Whitish, with brown specks.

Sources of information

Size
de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 6, p. 266.
Description
de la Peña 2025 (Aves Argentinas tomo 6).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Capped Heron (Pilherodius pileatus) egg, 49.4 × 36.5 mm

Capped Heron

Pilherodius pileatus

  • 49.4 × 36.5 mm (estimated)
  • Speculative: we haven't found a documented description of this egg yet, so we estimated its colours and markings and its size from related birds.
Breeds in Panama and South America (11 countries)
show all 12Central America: Panama
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Venezuela

No documented description found yet; drawn like the Black-crowned Night-Heron egg (same family).

Sources of information

Size
Estimated, no measurements found: the median length and width of measured eggs of the same family: Agamia agami, Ardea alba, Ardea cinerea, Ardea cocoi, Ardea herodias ….
Description
Estimated, no description found: drawn like a related egg (Black-crowned Night-Heron).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Cattle Egret (Ardea ibis) egg, 45.56 × 32.22 mm

Cattle Egret

Ardea ibis

  • 45.56 × 32.22 mm
  • Clutch: 2–4 eggs
Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (13 countries)
show all 26Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Curaçao, Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Pale sky blue to sea green.

Sources of information

Size
Average of 330 eggs: Arendt & Arendt 1988, Colonial Waterbirds 11(1): 72–84 (Montserrat, 330 eggs).
Agrees with: Cornell Lab of Ornithology, All About Birds: Cattle Egret, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Cattle Egret, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (Royal Saskatchewan Museum).
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Chilean Flamingo (Phoenicopterus chilensis) egg, 91.3 × 54.2 mm

Chilean Flamingo

Phoenicopterus chilensis

  • 91.3 × 54.2 mm
  • Clutch: 1 egg
Breeds in Argentina, Bolivia, Chile, Paraguay, Peru

Elliptical, white, chalky, rough and glossless.

Sources of information

Size
Average of 5 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 2. Akademie-Verlag, Berlin., p. 111.
Description
de la Peña 2025 (Aves Argentinas tomo 2); Oates 1902 (BM Egg Catalogue vol 2).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Cocoi Heron (Ardea cocoi) egg, 65.4 × 46.5 mm

Cocoi Heron

Ardea cocoi

  • 65.4 × 46.5 mm
  • Clutch: 3 eggs
Breeds in Panama and South America (13 countries)
show all 14Central America: Panama
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Pale sky blue, unmarked (some paler speckles/whitish traces).

Sources of information

Size
Average of 25 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 2. Akademie-Verlag, Berlin., p. 88.
Description
IUCN-SSC Heron Specialist Group, Herons of the World: Cocoi Heron; related: Hellebrekers 1942, Revision of the Penard oölogical collection from Surinam (Zool. Meded. 24).
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 6, p. 217.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Fasciated Tiger Heron (Tigrisoma fasciatum) egg, 58.5 × 44.7 mm

Fasciated Tiger Heron

Tigrisoma fasciatum

  • 58.5 × 44.7 mm (estimated)
  • Speculative: we haven't found a documented description of this egg yet, so we estimated its colours and markings and its size from related birds.
Breeds in Central America (4 countries) and South America (10 countries)
show all 14Central America: Costa Rica, Honduras, Nicaragua, Panama
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

No documented description found yet; drawn like the Bare-throated Tiger Heron egg (same genus).

Sources of information

Size
Estimated, no measurements found: the median length and width of measured eggs of the same genus: Tigrisoma lineatum, Tigrisoma mexicanum.
Description
Estimated, no description found: drawn like a related egg (Bare-throated Tiger Heron).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Glossy Ibis (Plegadis falcinellus) egg, 52.1 × 36.9 mm

Glossy Ibis

Plegadis falcinellus

  • 52.1 × 36.9 mm
  • Clutch: 3–4 eggs
Breeds in United States, Mexico, Costa Rica, Panama, Caribbean islands, Ecuador, Guyana, Venezuela

Pale greenish blue.

Sources of information

Size
Average of 75 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 47.
Agrees with: Cornell Lab of Ornithology, All About Birds: Glossy Ibis, Life History.
Description
Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 47.
Drawing checked against a photo: Bird Eggs of Canada photo (University of Saskatchewan Department of Biology Natural History Collection).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Great Blue Heron (Ardea herodias) egg, 64.5 × 45.2 mm

Great Blue Heron

Ardea herodias

  • 64.5 × 45.2 mm
  • Clutch: 2–6 eggs
Breeds in Canada and United States, Mexico, Central America (7 countries), the Caribbean and Ecuador
show all 12Canada & United States: Canada, United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Caribbean islands
South America: Ecuador

Pale blue, fading slightly with age.

Sources of information

Size
Average of 50 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 106.
Agrees with: Cornell Lab of Ornithology, All About Birds: Great Blue Heron, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Great Blue Heron, Life History.
Drawing checked against a photo: Flickr photo by Burke Museum; Bird Eggs of Canada photo (Royal Saskatchewan Museum).
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Great Egret (Ardea alba) egg, 56.5 × 40.5 mm

Great Egret

Ardea alba

  • 56.5 × 40.5 mm
  • Clutch: 1–6 eggs
Breeds in Canada and United States, Mexico, Central America (7 countries), the Caribbean and South America (13 countries)
show all 27Canada & United States: Canada, United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Bonaire, Sint Eustatius and Saba, Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Smooth, pale greenish blue.

Sources of information

Size
Average of 53 eggs: Bent, A. C. 1926. Life Histories of North American Marsh Birds. U.S. National Museum Bulletin 135, scan p. 158.
Description
Cornell Lab of Ornithology, All About Birds: Great Egret, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (University of Saskatchewan Department of Biology Natural History Collection); de la Peña 2025, Aves Argentinas tomo 6, p. 226.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Green Heron (Butorides virescens) egg, 38 × 29.5 mm

Green Heron

Butorides virescens

  • 38 × 29.5 mm
  • Clutch: 3–5 eggs
Breeds in Canada and United States, Mexico, Central America (7 countries) and the Caribbean
show all 15Canada & United States: Canada, United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Bonaire, Sint Eustatius and Saba, Curaçao, Trinidad and Tobago, Caribbean islands

Pale green to bluish.

Sources of information

Size
Average of 43 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 187.
Agrees with: Cornell Lab of Ornithology, All About Birds: Green Heron, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Green Heron, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (Royal Alberta Museum).
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Green Ibis (Mesembrinibis cayennensis) egg, 54.6 × 38.6 mm

Green Ibis

Mesembrinibis cayennensis

  • 54.6 × 38.6 mm
Breeds in Central America (4 countries) and South America (11 countries)
show all 15Central America: Costa Rica, Honduras, Nicaragua, Panama
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Venezuela

Deep olive green, mostly unmarked; some with fine brown or blackish spots or irregular lines at the larger end.

Sources of information

Size
Average of 6 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 2. Akademie-Verlag, Berlin., p. 107.
Description
Wetmore 1965, The Birds of the Republic of Panama, part 1.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Jabiru (Jabiru mycteria) egg, 78.4 × 58.3 mm

Jabiru

Jabiru mycteria

  • 78.4 × 58.3 mm
  • Clutch: 3–4 eggs
Breeds in Mexico, Central America (5 countries) and South America (8 countries)
show all 14Mexico: Mexico
Central America: Belize, Costa Rica, Guatemala, Honduras, Nicaragua
South America: Argentina, Bolivia, Brazil, Colombia, Guyana, Paraguay, Peru, Venezuela

White, unmarked.

Sources of information

Size
Average of 4 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 6, p. 120.
Description
de la Peña 2025 (Aves Argentinas tomo 6).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a James's Flamingo (Phoenicoparrus jamesi) egg, 82.8 × 51.1 mm

James's Flamingo

Phoenicoparrus jamesi

  • 82.8 × 51.1 mm
  • Clutch: 1 egg
Breeds in Argentina, Bolivia, Chile

Elliptical, white, unmarked, with a chalky coat.

Sources of information

Size
Average of 18 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 2, p. 12.
Description
de la Peña 2025 (Aves Argentinas tomo 2).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Least Bittern (Ixobrychus exilis) egg, 31 × 23.5 mm

Least Bittern

Ixobrychus exilis

  • 31 × 23.5 mm
  • Clutch: 2–6 eggs
Breeds in Canada and United States, Mexico, Central America (7 countries), the Caribbean and South America (10 countries)
show all 23Canada & United States: Canada, United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname

Pale blue or green.

Sources of information

Size
Average of 58 eggs: Bent, A. C. 1926. Life Histories of North American Marsh Birds. U.S. National Museum Bulletin 135, scan p. 106.
Description
Cornell Lab of Ornithology, All About Birds: Least Bittern, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (University of Saskatchewan Department of Biology Natural History Collection).
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Little Blue Heron (Egretta caerulea) egg, 44 × 33.5 mm

Little Blue Heron

Egretta caerulea

  • 44 × 33.5 mm
  • Clutch: 3–4 eggs
Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (10 countries)
show all 23Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Bonaire, Sint Eustatius and Saba, Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

Pale bluish green.

Sources of information

Size
Average of 54 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 179.
Agrees with: Cornell Lab of Ornithology, All About Birds: Little Blue Heron, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Little Blue Heron, Life History.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Little Egret (Egretta garzetta) egg, 46.2 × 33.5 mm

Little Egret

Egretta garzetta

  • 46.2 × 33.5 mm
  • Speculative: we haven't found a documented description of this egg yet, so we estimated its colours and markings from related birds.
Breeds in Caribbean islands

No documented description found yet; drawn like the Snowy Egret egg (same genus).

Sources of information

Size
Average of 312 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 2. Akademie-Verlag, Berlin., p. 91.
Description
Estimated, no description found: drawn like a related egg (Snowy Egret).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Maguari Stork (Ciconia maguari) egg, 75.8 × 52.7 mm

Maguari Stork

Ciconia maguari

  • 75.8 × 52.7 mm
  • Clutch: 3 eggs
Breeds in Argentina, Bolivia, Brazil, Colombia, Guyana, Paraguay, Uruguay, Venezuela

Dull white, unmarked, slightly glossy.

Sources of information

Size
Average of 15 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 6, p. 114.
Description
Oates 1902 (BM Egg Catalogue vol 2); de la Peña 2025 (Aves Argentinas tomo 6).
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 6, p. 114.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Pinnated Bittern (Botaurus pinnatus) egg, 51.8 × 40.5 mm

Pinnated Bittern

Botaurus pinnatus

  • 51.8 × 40.5 mm
  • Clutch: 2–3 eggs
Breeds in Mexico, Central America (6 countries), Trinidad and Tobago and South America (11 countries)
show all 19Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua
The Caribbean: Trinidad and Tobago
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Suriname, Uruguay, Venezuela

Pale olive, unmarked.

Sources of information

Size
Average of 2 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 6, p. 181.
Description
de la Peña 2025 (Aves Argentinas tomo 6).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Plumbeous Ibis (Theristicus caerulescens) egg, 67.7 × 43.1 mm

Plumbeous Ibis

Theristicus caerulescens

  • 67.7 × 43.1 mm
  • Clutch: 2–3 eggs
Breeds in Argentina, Bolivia, Brazil, Paraguay, Uruguay

Light brown or ochre, blotched rufous, violet, dark brown and cinnamon towards the larger end, with fine dark streaks there.

Sources of information

Size
Average of 4 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 6, p. 264.
Description
de la Peña 2025 (Aves Argentinas tomo 6).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Puna Ibis (Plegadis ridgwayi) egg, 52 × 35.4 mm

Puna Ibis

Plegadis ridgwayi

  • 52 × 35.4 mm
Breeds in Argentina, Bolivia, Peru

Unmarked pale turquoise to pale blue-green.

Sources of information

Size
Average of 8 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 2. Akademie-Verlag, Berlin., p. 108.
Description
Nehrkorn 1899 (Katalog der Eiersammlung).
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 6, p. 255.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Reddish Egret (Egretta rufescens) egg, 51 × 37.6 mm

Reddish Egret

Egretta rufescens

  • 51 × 37.6 mm
  • Clutch: 3–6 eggs
Breeds in United States, Mexico, Bonaire, Sint Eustatius and Saba, Caribbean islands, Colombia, Venezuela

Pale bluish green.

Sources of information

Size
Average of 42 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 161.
Agrees with: Cornell Lab of Ornithology, All About Birds: Reddish Egret, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Reddish Egret, Life History.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Roseate Spoonbill (Platalea ajaja) egg, 65 × 43.9 mm

Roseate Spoonbill

Platalea ajaja

  • 65 × 43.9 mm
  • Clutch: 1–5 eggs
Breeds in United States, Mexico, Central America (7 countries) and South America (12 countries)
show all 21Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Whitish to pale green, evenly covered with brown spots.

Sources of information

Size
Average of 40 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 16.
Agrees with: Cornell Lab of Ornithology, All About Birds: Roseate Spoonbill, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Roseate Spoonbill, Life History.
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 6, p. 275.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Rufescent Tiger Heron (Tigrisoma lineatum) egg, 59.75 × 44.95 mm

Rufescent Tiger Heron

Tigrisoma lineatum

  • 59.75 × 44.95 mm (approx.)
  • Clutch: 2 eggs
Breeds in Central America (4 countries), Trinidad and Tobago and South America (12 countries)
show all 17Central America: Costa Rica, Honduras, Nicaragua, Panama
The Caribbean: Trinidad and Tobago
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Clear pale sky blue, dotted and lightly blotched with brown and violet.

Sources of information

Size
Rossi 1958, quoted in Wetmore, A. 1965. The birds of the Republic of Panamá, part 1. Smithsonian Miscellaneous Collections 150(1)., pp. 108–109.
Description
Wetmore 1965, The Birds of the Republic of Panama pt 1 (Smithson. Misc. Coll. 150), quoting Rossi 1958 and Guimarães Sobrinho 1932.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Scarlet Ibis (Eudocimus ruber) egg, 56.03 × 37.06 mm

Scarlet Ibis

Eudocimus ruber

  • 56.03 × 37.06 mm
  • Clutch: 1–5 eggs
Breeds in Trinidad and Tobago, Brazil, Colombia, Ecuador, French Guiana, Guyana, Suriname, Venezuela

Dull green to greenish or bluish white, spotted and blotched with dark and light brown, often more at the large end; dull.

Sources of information

Size
Average of 100 eggs: Hellebrekers, W. P. J. 1942. Revision of the Penard oölogical collection from Surinam. Zoologische Mededelingen 24: 240–275., p. 242.
Description
Hauber, M. E. (ed.) 2014. The Book of Eggs. University of Chicago Press (photo and text), p. 109; supporting: Hellebrekers, W. P. J. 1942. Revision of the Penard oölogical collection from Surinam. Zool. Meded. 24.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Sharp-tailed Ibis (Cercibis oxycerca) egg, 69 × 47 mm

Sharp-tailed Ibis

Cercibis oxycerca

  • 69 × 47 mm (approx.)
Breeds in Brazil, Colombia, Guyana, Venezuela

Dirty white, essentially unmarked, with occasional faint brown clouds.

Sources of information

Size
Nehrkorn, A. 1899. Katalog der Eiersammlung nebst Beschreibungen der aussereuropäischen Eier. Braunschweig.
Description
Nehrkorn 1899 (Katalog der Eiersammlung).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Snowy Egret (Egretta thula) egg, 43 × 32.4 mm

Snowy Egret

Egretta thula

  • 43 × 32.4 mm
  • Clutch: 2–6 eggs
Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (13 countries)
show all 27Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Bonaire, Sint Eustatius and Saba, Curaçao, Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Pale greenish blue.

Sources of information

Size
Average of 46 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 150.
Agrees with: Cornell Lab of Ornithology, All About Birds: Snowy Egret, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Snowy Egret, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (University of Saskatchewan Department of Biology Natural History Collection); de la Peña 2025, Aves Argentinas tomo 6, p. 240.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Striated Heron (Butorides striata) egg, 37.6 × 27.8 mm

Striated Heron

Butorides striata

  • 37.6 × 27.8 mm
  • Clutch: 1–5 eggs
Breeds in Panama, the Caribbean and South America (12 countries)
show all 15Central America: Panama
The Caribbean: Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Pale green-blue, unmarked, dulling during incubation.

Sources of information

Size
Average of 50 eggs: Hellebrekers, W. P. J. 1942. Revision of the Penard oölogical collection from Surinam. Zoologische Mededelingen 24: 240–275., p. 243.
Description
IUCN-SSC Heron Specialist Group, Herons of the World: Striated Heron; related: Hellebrekers 1942, Revision of the Penard oölogical collection from Surinam (Zool. Meded. 24).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Stripe-backed Bittern (Botaurus involucris) egg, 33.2 × 25.6 mm

Stripe-backed Bittern

Botaurus involucris

  • 33.2 × 25.6 mm
Breeds in Trinidad and Tobago and South America (9 countries)
show all 10The Caribbean: Trinidad and Tobago
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Guyana, Paraguay, Uruguay, Venezuela

Pale yellowish green, unmarked.

Sources of information

Size
Average of 36 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 2. Akademie-Verlag, Berlin., p. 93.
Description
Nehrkorn 1899 (Katalog der Eiersammlung).
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 6, p. 187.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Tricolored Heron (Egretta tricolor) egg, 44.1 × 32.3 mm

Tricolored Heron

Egretta tricolor

  • 44.1 × 32.3 mm
  • Clutch: 3–5 eggs
Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (8 countries)
show all 22Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Bonaire, Sint Eustatius and Saba, Curaçao, Trinidad and Tobago, Caribbean islands
South America: Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

Pale greenish blue.

Sources of information

Size
Average of 41 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 172.
Agrees with: Cornell Lab of Ornithology, All About Birds: Tricolored Heron, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Tricolored Heron, Life History.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Whistling Heron (Syrigma sibilatrix) egg, 46.3 × 36.5 mm

Whistling Heron

Syrigma sibilatrix

  • 46.3 × 36.5 mm
  • Clutch: 3–4 eggs
Breeds in Argentina, Bolivia, Brazil, Colombia, Ecuador, Paraguay, Uruguay, Venezuela

Pale sepia or greenish, with small brown and grey specks and spots.

Sources of information

Size
Average of 10 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 6, p. 233.
Description
de la Peña 2025 (Aves Argentinas tomo 6).
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 6, p. 233.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a White Ibis (Eudocimus albus) egg, 57.6 × 38.3 mm

White Ibis

Eudocimus albus

  • 57.6 × 38.3 mm
Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (4 countries)
show all 14Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Caribbean islands
South America: Colombia, Ecuador, Peru, Venezuela

Cream to blue-green eggs with brown splotches.

Sources of information

Size
Average of 80 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 28.
Description
Cornell Lab of Ornithology, All About Birds: White Ibis, Life History.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a White-faced Ibis (Plegadis chihi) egg, 51.5 × 36 mm

White-faced Ibis

Plegadis chihi

  • 51.5 × 36 mm
  • Clutch: 3–5 eggs
Breeds in United States, Mexico, Argentina, Bolivia, Brazil, Chile, Paraguay, Uruguay

Turquoise to pale bluish green, unmarked.

Sources of information

Size
Average of 46 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 54.
Agrees with: Cornell Lab of Ornithology, All About Birds: White-faced Ibis, Life History.
Description
Cornell Lab of Ornithology, All About Birds: White-faced Ibis, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (Royal Alberta Museum); de la Peña 2025, Aves Argentinas tomo 6, p. 250.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Wood Stork (Mycteria americana) egg, 67.9 × 46 mm

Wood Stork

Mycteria americana

  • 67.9 × 46 mm
  • Clutch: 1–5 eggs
Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (10 countries)
show all 20Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Caribbean islands
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Venezuela

Creamy white.

Sources of information

Size
Average of 40 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 60.
Agrees with: Cornell Lab of Ornithology, All About Birds: Wood Stork, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Wood Stork, Life History.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Yellow-crowned Night-Heron (Nyctanassa violacea) egg, 51.3 × 36.9 mm

Yellow-crowned Night-Heron

Nyctanassa violacea

  • 51.3 × 36.9 mm
  • Clutch: 2–6 eggs
Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (8 countries)
show all 22Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Bonaire, Sint Eustatius and Saba, Curaçao, Trinidad and Tobago, Caribbean islands
South America: Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

Pale bluish green.

Sources of information

Size
Average of 40 eggs: Bent, Life Histories of North American Marsh Birds (U.S. National Museum Bulletin 135, 1927), p. 215.
Agrees with: Cornell Lab of Ornithology, All About Birds: Yellow-crowned Night-Heron, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Yellow-crowned Night-Heron, Life History.
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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Illustration of a Zigzag Heron (Zebrilus undulatus) egg, 49.4 × 36.5 mm

Zigzag Heron

Zebrilus undulatus

  • 49.4 × 36.5 mm (estimated)
  • Speculative: we haven't found a description of this egg (a source we checked reports it as undescribed), so we estimated its colours and markings and its size from related birds.
Breeds in South America (9 countries)
show all 9South America: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

No documented description found yet; drawn like the Black-crowned Night-Heron egg (same family).

Sources of information

Size
Estimated, no measurements found: the median length and width of measured eggs of the same family: Agamia agami, Ardea alba, Ardea cinerea, Ardea cocoi, Ardea herodias ….
Description
Estimated, no description found: drawn like a related egg (Black-crowned Night-Heron).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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