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Eggs

Illustration of a Brown-headed Cowbird (Molothrus ater) egg, 21.45 × 16.42 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Molothrus ater

  • 21.45 × 16.42 mm
  • Clutch: 1–7 eggs
Breeds in Canada, United States, Mexico

White to grayish-white with brown or gray spots.

Sources of information

Size
Average of 127 eggs: Bent, Life Histories of North American Blackbirds, Orioles, Tanagers, and Allies (U.S. National Museum Bulletin 211, 1958), p. 439.
Agrees with: Cornell Lab of Ornithology, All About Birds: Brown-headed Cowbird, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Brown-headed Cowbird, Life History.
Drawing checked against a photo: Wikimedia Commons photo.
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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