Eggs

26 eggs at true relative size, from the 35 mm egg of the American Kestrel to the 63.4 mm egg of the Striated Caracara.

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.

American Kestrel

Falco sparverius

• 35 × 29 mm
• Clutch: 4–5 eggs

Breeds in Canada and United States, Mexico, Central America (7 countries), the Caribbean and South America (11 countries)

show all 24

Canada & United States: Canada, United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Curaçao, Caribbean islands
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Uruguay, Venezuela

White to yellowish or light reddish-brown, mottled with violet-magenta, gray, or brown.

Sources of information

Size

Average of 169 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 110.

Description

Cornell Lab of Ornithology, All About Birds: American Kestrel, Life History.
Drawing checked against a photo: Wikimedia Commons 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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Aplomado Falcon

Falco femoralis

• 44.5 × 34.5 mm
• Clutch: 2–4 eggs

Breeds in United States, Mexico, Central America (7 countries) and South America (12 countries)

show all 21

Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Whitish with scattered brownish spots.

Sources of information

Size

Average of 56 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 97.
Agrees with: Cornell Lab of Ornithology, All About Birds: Aplomado Falcon, Life History.

Description

Cornell Lab of Ornithology, All About Birds: Aplomado Falcon, 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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Barred Forest Falcon

Micrastur ruficollis

• 43.8 × 34.2 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 Mexico, Central America (7 countries) and South America (11 countries)

show all 19

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, Venezuela

No documented description found yet; drawn like the Aplomado Falcon egg (same family).

Sources of information

Size

Average of 31 eggs: Thorstrom, R., J. D. Ramos & C. M. Morales 2000, Breeding biology of Barred Forest-Falcons (Micrastur ruficollis) in northeastern Guatemala, Auk 117(3): 781–786.

Description

Estimated, no description found: drawn like a related egg (Aplomado Falcon).

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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Bat Falcon

Falco rufigularis

• 40.8 × 31.81 mm
• Clutch: 3 eggs

Breeds in Mexico, Central America (7 countries), Trinidad and Tobago and South America (11 countries)

show all 20

Mexico: 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

Pinkish white almost wholly covered by a blotchy clay-coloured wash, deeper brown around the larger end.

Sources of information

Size

Average of 20 eggs: Boyce, D.A. Jr. & Kiff, L.F. 1981. Have the eggs of the Orange-breasted Falcon (Falco deiroleucus) been described? Raptor Research 15(3): 89-93, p. 90 (Table 1).

Description

Wetmore, A. 1965. The birds of the Republic of Panamá, part 1. Smithsonian Miscellaneous Collections 150(1)., p. 286.

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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Black Caracara

Daptrius ater

• 53.5 × 40.2 mm

Breeds in South America (9 countries)

show all 9

South America: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

Light cream, almost wholly covered with large and small chocolate and red-brown spots, running together at the blunt end; nearly lustreless, short oval.

Sources of information

Size

Average of 3 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 3. Akademie-Verlag, Berlin., p. 186.

Description

Penard, F. P. & A. P. Penard 1908. De vogels van Guyana (Suriname, Cayenne en Demerara), deel 1. Paramaribo., p. 373.

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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Buckley's Forest Falcon

Micrastur buckleyi

• 50.1 × 38.9 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, Brazil, Ecuador, Peru

No documented description found yet; drawn like the Aplomado Falcon egg (same family).

Sources of information

Size

Estimated, no measurements found: the median length and width of measured eggs of the same genus: Micrastur ruficollis, Micrastur semitorquatus.

Description

Estimated, no description found: drawn like a related egg (Aplomado Falcon).

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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Carunculated Caracara

Daptrius carunculatus

• 53.5 × 40.2 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 Colombia, Ecuador

Buff to pale cinnamon, blotched and mottled with reddish-brown and lilac-grey, little gloss.

Sources of information

Size

Estimated, no measurements found: the median length and width of measured eggs of the same genus: Daptrius albogularis, Daptrius ater, Daptrius australis, Daptrius chimachima, Daptrius chimango.

Description

Oates 1901 (BM Egg Catalogue vol 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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Chimango Caracara

Daptrius chimango

• 43.36 × 34.14 mm
• Clutch: 3 eggs

Breeds in Argentina, Bolivia, Brazil, Chile, Paraguay, Uruguay

Ochre to cream, speckled and spotted chestnut and reddish all over, sometimes heavily blotched rufous; little gloss.

Sources of information

Size

Average of 58 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 7, p. 413.

Description

Oates 1902 (BM Egg Catalogue vol 2); de la Peña 2025 (Aves Argentinas tomo 7).

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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Collared Forest Falcon

Micrastur semitorquatus

• 56.4 × 43.6 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 Mexico, Central America (7 countries) and South America (11 countries)

show all 19

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, Venezuela

No documented description found yet; drawn like the Aplomado Falcon egg (same family).

Sources of information

Size

Average of 9 eggs: Thorstrom, R., J. D. Ramos & J. M. Castillo 2000, Breeding biology and behavior of the Collared Forest-Falcon (Micrastur semitorquatus) in Guatemala, Ornitología Neotropical 11: 1–12.

Description

Estimated, no description found: drawn like a related egg (Aplomado Falcon).

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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Crested Caracara

Caracara plancus

• 59.4 × 46.5 mm
• Clutch: 1–4 eggs

Breeds in United States, Mexico, Central America (7 countries), the Caribbean and South America (14 countries)

show all 28

Canada & 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, Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Cinnamon-colored with heavy brown spotting.

Sources of information

Size

Average of 57 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 130.
Agrees with: Cornell Lab of Ornithology, All About Birds: Crested Caracara, Life History.

Description

Cornell Lab of Ornithology, All About Birds: Crested Caracara, 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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Cryptic Forest Falcon

Micrastur mintoni

• 50.1 × 38.9 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, Brazil

No documented description found yet; drawn like the Aplomado Falcon egg (same family).

Sources of information

Size

Estimated, no measurements found: the median length and width of measured eggs of the same genus: Micrastur ruficollis, Micrastur semitorquatus.

Description

Estimated, no description found: drawn like a related egg (Aplomado Falcon).

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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Gyrfalcon

Falco rusticolus

• 58.7 × 45.7 mm
• Clutch: 1–5 eggs

Breeds in Canada, United States

Ranging from white to reddish brown, with variable cinnamon spots.

Sources of information

Size

Average of 90 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 5.
Agrees with: Cornell Lab of Ornithology, All About Birds: Gyrfalcon, Life History.

Description

Cornell Lab of Ornithology, All About Birds: Gyrfalcon, Life History.
Drawing checked against a photo: Wikimedia Commons 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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Laughing Falcon

Herpetotheres cachinnans

• 58.6 × 43.95 mm
• Clutch: 1 egg

Breeds in Mexico, Central America (7 countries) and South America (11 countries)

show all 19

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, Venezuela

Ground almost hidden by a dark chocolate-brown wash with burnt-umber splashes, or cinnamon-buff to clay heavily blotched chestnut-brown.

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. 263.

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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Lined Forest Falcon

Micrastur gilvicollis

• 50.1 × 38.9 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 South America (9 countries)

show all 9

South America: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

No documented description found yet; drawn like the Aplomado Falcon egg (same family).

Sources of information

Size

Estimated, no measurements found: the median length and width of measured eggs of the same genus: Micrastur ruficollis, Micrastur semitorquatus.

Description

Estimated, no description found: drawn like a related egg (Aplomado Falcon).

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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Merlin

Falco columbarius

• 40.2 × 31.3 mm
• Clutch: 4–5 eggs

Breeds in Canada, United States

Rusty brown marked with brown or chestnut.

Sources of information

Size

Average of 55 eggs: Bent, A. C. 1938. Life histories of North American birds of prey, part 2. U.S. National Museum Bulletin 170, p. 73 (scan leaf 85).
Agrees with: Bent, A. C. 1938. Life histories of North American birds of prey, part 2. U.S. National Museum Bulletin 170 — Richardson's pigeon hawk F. c. richardsonii, p. 88 (scan leaf 100).

Description

Cornell Lab of Ornithology, All About Birds: Merlin, 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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Mountain Caracara

Daptrius megalopterus

• 53.5 × 40.2 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 Argentina, Bolivia, Chile, Ecuador, Peru

No documented description found yet; drawn like the Black Caracara egg (same genus).

Sources of information

Size

Estimated, no measurements found: the median length and width of measured eggs of the same genus: Daptrius albogularis, Daptrius ater, Daptrius australis, Daptrius chimachima, Daptrius chimango.

Description

Estimated, no description found: drawn like a related egg (Black Caracara).

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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Orange-breasted Falcon

Falco deiroleucus

• 41.42 × 34.8 mm
• Clutch: 2–3 eggs

Breeds in Mexico, Central America (3 countries) and South America (11 countries)

show all 15

Mexico: Mexico
Central America: Belize, Guatemala, Panama
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Venezuela

Whitish or yellowish ground largely obscured by smears and blotches of browny-red and dark red.

Sources of information

Size

Average of 5 eggs: Wetmore, A. 1965. The birds of the Republic of Panamá, part 1 (Tinamidae to Rynchopidae). Smithsonian Miscellaneous Collections 150(1)., p. 283.

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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Peregrine Falcon

Falco peregrinus

• 52 × 41 mm
• Clutch: 2–5 eggs

Breeds in Canada and United States, Mexico, Central America (7 countries) and South America (6 countries)

show all 16

Canada & United States: Canada, United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
South America: Argentina, Bolivia, Chile, Ecuador, Falkland Islands, Peru

Pale creamy to brownish, dotted or blotched with brown, red, or purple.

Sources of information

Size

Average of 61 eggs: Bent, A. C. 1938. Life histories of North American birds of prey, part 2. U.S. National Museum Bulletin 170, p. 50 (scan leaf 62).
Agrees with: Bent, A. C. 1938. Life histories of North American birds of prey, part 2. U.S. National Museum Bulletin 170 — Peale's falcon F. p. pealei, p. 69 (scan leaf 81).

Description

Cornell Lab of Ornithology, All About Birds: Peregrine Falcon, Life History.
Drawing checked against a photo: Wikimedia Commons 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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Plumbeous Forest Falcon

Micrastur plumbeus

• 50.1 × 38.9 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 Colombia, Ecuador

No documented description found yet; drawn like the Aplomado Falcon egg (same family).

Sources of information

Size

Estimated, no measurements found: the median length and width of measured eggs of the same genus: Micrastur ruficollis, Micrastur semitorquatus.

Description

Estimated, no description found: drawn like a related egg (Aplomado Falcon).

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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Prairie Falcon

Falco mexicanus

• 52.3 × 40.5 mm
• Clutch: 2–6 eggs

Breeds in Canada, United States, Mexico

Creamy white to pink or russet, spotted with brown or cinnamon.

Sources of information

Size

Average of 331 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 24.
Agrees with: Cornell Lab of Ornithology, All About Birds: Prairie Falcon, Life History.

Description

Cornell Lab of Ornithology, All About Birds: Prairie Falcon, 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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Red-throated Caracara

Ibycter americanus

• 56 × 43 mm (approx.)

Breeds in Mexico, Central America (4 countries) and South America (9 countries)

show all 14

Mexico: Mexico
Central America: Costa Rica, Honduras, Nicaragua, Panama
South America: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

Light cream, almost wholly covered with large and small chocolate and red-brown spots, running together at the blunt end; nearly lustreless.

Sources of information

Size

Penard, F. P. & A. P. Penard 1908. De vogels van Guyana (Suriname, Cayenne en Demerara), deel 1. Paramaribo., p. 374.

Description

Penard, F. P. & A. P. Penard 1908. De vogels van Guyana (Suriname, Cayenne en Demerara), deel 1. Paramaribo., p. 374.

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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Slaty-backed Forest Falcon

Micrastur mirandollei

• 50.1 × 38.9 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 (9 countries)

show all 13

Central America: Costa Rica, Honduras, Nicaragua, Panama
South America: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela

No documented description found yet; drawn like the Aplomado Falcon egg (same family).

Sources of information

Size

Estimated, no measurements found: the median length and width of measured eggs of the same genus: Micrastur ruficollis, Micrastur semitorquatus.

Description

Estimated, no description found: drawn like a related egg (Aplomado Falcon).

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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Make a 3D-printable copy of this egg

Spot-winged Falconet

Spiziapteryx circumcincta

• 39.7 × 31.3 mm
• Clutch: 3–4 eggs

Breeds in Argentina, Bolivia, Paraguay

Ochre with reddish-brown speckles all over.

Sources of information

Size

Average of 3 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 7, p. 387.

Description

de la Peña 2025 (Aves Argentinas tomo 7).

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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Striated Caracara

Daptrius australis

• 63.4 × 48.1 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 Argentina, Chile, Falkland Islands

No documented description found yet; drawn like the Black Caracara egg (same genus).

Sources of information

Size

Average of 22 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 3. Akademie-Verlag, Berlin., p. 186.

Description

Estimated, no description found: drawn like a related egg (Black Caracara).

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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White-throated Caracara

Daptrius albogularis

• 61.6 × 47.3 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 Argentina, Chile

No documented description found yet; drawn like the Black Caracara egg (same genus).

Sources of information

Size

Average of 15 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 3. Akademie-Verlag, Berlin., p. 186.

Description

Estimated, no description found: drawn like a related egg (Black Caracara).

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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Yellow-headed Caracara

Daptrius chimachima

• 43.2 × 34.8 mm
• Clutch: 2 eggs

Breeds in Central America (4 countries), the Caribbean and South America (12 countries)

show all 18

Central America: Costa Rica, Honduras, Nicaragua, Panama
The Caribbean: Aruba, Trinidad and Tobago
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Buff to yellowish brown, heavily blotched and smeared with deep red and dark mahogany, often almost wholly red-brown.

Sources of information

Size

Average of 24 eggs: Schönwetter, M. 1960–1992. Handbuch der Oologie (ed. W. Meise), Lieferung 3. Akademie-Verlag, Berlin., p. 186.

Description

Wetmore 1965, Birds of the Republic of Panama pt 1 (after Wolfe 1938), pp. 274–276.

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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