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Horned Screamer Anhima cornuta

  • Order: Anseriformes
  • Family: Anhimidae
  • Monotypic
  • Authors: Piland, Natalia
Sections

Breeding

Males help to construct a floating platform nest out of vegetation such as water hyacinth and Paspalum dilatatum (Naranjo 1986). In the Cauca valley in Colombia, the breeding season is from late November to early May (Naranjo 1986), but the breeding season probably varies geographically; e.g. Hilty and Brown (1986) report a nest with eggs in August in Amazonian Colombia.

The female lays a clutch of 2-7 eggs, with each egg laid at 2-day intervals (Kear 2005). The eggs vary in color from white to cinnamon-brown and measure 84.6 x 61.02 ± 3.2 x 1.9 mm, and weigh 149.9 ± 11.02 g (n = 9) (Naranjo 1986). Incubation is shared by both parents. The female mainly incubates during the day, while the male incubates during the night. Incubation does not start until the clutch is complete. Juveniles stay with parents for at least one year (Naranjo 1986).

Recommended Citation

Piland, Natalia. 2010. Horned Screamer (Anhima cornuta), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, editor). Cornell Lab of Ornithology, Ithaca, New York, USA. https://doi.org/10.2173/nb.horscr1.01