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Illustration of a Forster's Tern (Sterna forsteri) egg, 43 × 31 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Sterna forsteri

  • 43 × 31 mm
  • Clutch: 1–4 eggs
Breeds in Canada, United States, Mexico

Olive to buff, marked with numerous small spots and blotches of dark brown, often concentrated around the larger end.

Sources of information

Size
Average of 65 eggs: Bent, Life Histories of North American Gulls and Terns (U.S. National Museum Bulletin 113, 1921), p. 233.
Agrees with: Cornell Lab of Ornithology, All About Birds: Forster's Tern, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Forster's Tern, 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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