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Eggs

Illustration of a Bronzed Cowbird (Molothrus aeneus) egg, 23.11 × 18.29 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Molothrus aeneus

  • 23.11 × 18.29 mm
  • Clutch: 1 egg
Breeds in United States, Mexico, Central America (7 countries) and Colombia
show all 10Canada & United States: United States
Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
South America: Colombia

Unmarked bluish green.

Sources of information

Size
Average of 38 eggs: Bent, Life Histories of North American Blackbirds, Orioles, Tanagers, and Allies (U.S. National Museum Bulletin 211, 1958), p. 461.
Description
Cornell Lab of Ornithology, All About Birds: Bronzed Cowbird, Life History.
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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