Guanay Cormorant Phalacrocorax bougainvillii

  • Order: Suliformes
  • Family: Phalacrocoracidae
  • Monotypic
  • Authors: Mark A. Baran and Michael G. Harvey


Breed year-round, with peak reproduction occurring in November and December (Johnson and Goodall 1965). Cormorants nest in large monospecific colonies, which always exceed 1,000 pairs. Nests are scrapes in the ground created from guano, feathers, and other debris, with a diameter of 32 ± 4 cm (Duffy 1983a). A pair will lay 3 pale blue-green eggs (62.7 ± 1.36 x 40.3 ± 0.75 mm) and rear greater than 2 young, typically raising two broods per year (Murphy 1936, Johnson and Goodall 1965).

Recommended Citation

Baran, M. A. and M. G. Harvey (2011). Guanay Cormorant (Phalacrocorax bougainvillii), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA.