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Illustration of a Fork-tailed Storm-Petrel (Hydrobates furcatus) egg, 33.9 × 25.7 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Hydrobates furcatus

  • 33.9 × 25.7 mm
Breeds in Canada, United States

Dull white, often with blunt end encircled by ring of dark purplish-red spots.

Sources of information

Size
Average of 40 eggs: Bent, Life Histories of North American Petrels and Pelicans and Their Allies (U.S. National Museum Bulletin 121, 1922), p. 134.
Description
Cornell Lab of Ornithology, All About Birds: Fork-tailed Storm-Petrel, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (Royal Alberta Museum).
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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