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Eggs

Illustration of a Black-crowned Night-Heron (Nycticorax nycticorax) egg, 51.5 × 37 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

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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