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Illustration of a Gyrfalcon (Falco rusticolus) egg, 58.7 × 45.7 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

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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