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Eggs

Illustration of a Black-headed Duck (Heteronetta atricapilla) egg, 58.24 × 43.83 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Heteronetta atricapilla

  • 58.24 × 43.83 mm
  • Clutch: 1–8 eggs
Breeds in Argentina, Brazil, Chile, Paraguay, Uruguay

Pale greenish ochre to greyish white, unmarked.

Sources of information

Size
Average of 48 eggs: de la Peña, M. R. 2025. Aves Argentinas: descripción, comportamiento, reproducción y distribución. Comunicaciones del Museo Provincial de Ciencias Naturales "Florentino Ameghino" (Nueva Serie). Santa Fe., tomo 1, p. 255.
Description
de la Peña 2025 (Aves Argentinas tomo 1).
Drawing checked against a photo: de la Peña 2025, Aves Argentinas tomo 1, p. 255.
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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