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Illustration of a Sooty Tern (Onychoprion fuscatus) egg, 50 × 35 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Onychoprion fuscatus

  • 50 × 35 mm
Breeds in United States, Mexico, Central America (3 countries), the Caribbean and South America (5 countries)
show all 13Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, Panama
The Caribbean: Aruba, Trinidad and Tobago, Caribbean islands
South America: Brazil, Chile, Ecuador, French Guiana, Venezuela

White, buff, or pink, with brown, black, and/or lilac speckling.

Sources of information

Size
Average of 76 eggs: Bent, Life Histories of North American Gulls and Terns (U.S. National Museum Bulletin 113, 1921), p. 281.
Description
Cornell Lab of Ornithology, All About Birds: Sooty Tern, 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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