Overview
Double-crested Cormorant: Medium cormorant with iridescent black body and orange throat pouch. Western birds have white feather tufts over each eye in early summer. Pale bill is long and hooked. Black legs and feet. Feeds on fish, amphibians and crustaceans. Strong direct flight, soars on thermals.
Range and Habitat
Double-crested Cormorant: Breeds locally from Alaska, Manitoba, and Newfoundland south to Mexico and Bahamas. Spends winters mainly on coasts north to Alaska and southern New England. Preferred habitats include lakes, rivers, swamps, and coasts.
Cormorants (Phalacrocoracidae)
ORDER
The order PELECANIFORMES (pronounced pel-leh-KAN-ih-FOR-meez) is composed of six families of aquatic birds such as the large, broad-winged pelicans, aerodynamically shaped frigatebirds and the cormorants.
FAMILY TAXONOMY
A family with a worldwide distribution, there are thirty-six species of cormorants in three genera in the Phalacrocoracidae (pronounced fah-lah-kroh-koh-RAH-kih-dee).
NORTH AMERICA
The six species of cormorants found in North America are all placed in the same genus. Representatives of this family include the widespread Double-crested Cormorant, and the Red-faced and Pelagic Cormorants of the Pacific Coast.
KNOWN FOR
Cormorants are most well known for their piscivorous (fish-eating) diet, the Double-crested Cormorant so much so that it has been persecuted in some areas for supposedly being a competitor with fisherman.
PHYSICAL
Cormorants are large birds with long, thick necks, longish tails and rather long, broad wings. They have thin bills with a sharp hooked tip ideally suited for catching fish and also have short legs with webbed feet. Like many other Pelecaniformes, cormorants have a bare patch of expandable skin on the throat.
COLORATION
Adult plumages of North American cormorant species are mostly black, juvenile plumages being brown and white. White is also found in the adult plumages of some species in the form of patches near the tail and wispy plumes that adorn breeding birds. Most species of cormorants also show bits of red or yellow on the bill and throat patch.
GEOGRAPHIC HABITAT
Cormorants fish in most aquatic habitats in North America, especially in larger bodies of water such as lakes, rivers and coastal habitats. The coasts harbor such species as the Great Cormorant of the North Atlantic, and the Brandt’s, Pelagic, and Red-faced Cormorants of the Pacific. The Neotropic Cormorant is mostly found in subtropical waters of southern Texas while the Double-crested ranges in both fresh and salt water.
MIGRATION
Cormorants are mostly resident, becoming short-distance migrants to open water when the lakes and rivers of their breeding grounds freeze over during the winter.
HABITS
Cormorants are very social birds that nest in colonies, and often occur in flocks while migrating and feeding. They forage for fish by swimming underwater after diving from the surface.
CONSERVATION
Cormorant species are not endangered with the Double-crested Cormorant actually dramatically increasing in number. Members of this family, however, are potentially threatened by oil spills.
INTERESTING FACTS
Cormorants stretch their wings out to dry after feeding even if they haven’t entered the water (as with captive birds). While drying their wings, they often perch at communal roosting and breeding sites, most of the trees defoliated and killed by the profuse amount of excrement produced by the birds.