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Illustration of a Masked Duck (Nomonyx dominicus) egg, 54.65 × 40.8 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Nomonyx dominicus

  • 54.65 × 40.8 mm (approx.)
  • Clutch: 4–6 eggs
Breeds in Mexico, Central America (7 countries), the Caribbean and South America (12 countries)
show all 22Mexico: Mexico
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Caribbean: Trinidad and Tobago, Caribbean islands
South America: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela

Pale buff to buffy white, smoother than Ruddy Duck's, unmarked.

Sources of information

Size
Wetmore, A. 1965. The birds of the Republic of Panamá, part 1 (Tinamidae to Rynchopidae). Smithsonian Miscellaneous Collections 150(1)., pp. 152-153.
Description
Wetmore 1965, The Birds of the Republic of Panamá, Part 1 (Smithsonian Misc. Coll. 150).
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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