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The double-crested cormorant (Nannopterum auritum) is a member of the cormorant family of water birds. It is found near rivers and lakes and in coastal areas and is widely distributed across North America, from the Aleutian Islands in Alaska down to Florida and Mexico. Measuring 70–90 cm (28–35 in) in length, it is entirely black except for ...
Double-crested cormorant. Birds portal; Animals portal; Cormorant culling is the intentional killing of cormorants by humans for the purposes of wildlife management. It has been practiced for centuries, with supporters of culling generally arising from the angling community. Culling techniques may involve the killing of birds, the destruction ...
This name was coined for the flightless cormorant, which does indeed have small wings. Genetic studies have found that the neotropic and double-crested cormorants form a clade with the flightless cormorant, and they are thus placed together in the genus Nannopterum despite both species having normal-sized wings and full flight capabilities. [4]
At its 2013 peak, this was the largest double-crested cormorant colony in North America, with some 30,000 birds, more than 40% of the species’ population in the western U.S., according to the Corps.
Japanese cormorant: Phalacrocorax capillatus: 20 White-breasted cormorant: Phalacrocorax lucidus: 21 Great cormorant: Phalacrocorax carbo: 22 European shag: Gulosus aristotelis: 23 Flightless cormorant: Nannopterum harrisi: 24 Neotropic cormorant: Nannopterum brasilianum: 25 Double-crested cormorant: Nannopterum auritum: 26 Rock shag ...
The three primary factors influencing quality panfish populations are predators, prey, and the environment. [17] In eastern North America, yellow perch are an extremely important food source for birds such as double-crested cormorants. The cormorants specifically target yellow perch as primary prey.
This bird is often mistaken for the double-crested cormorant due to its similar size and shape, although the two species can be differentiated by their tails and bills. The tail of the anhinga is wider and much longer than the cormorant's. The bill of the anhinga is pointed, while the bill of the cormorant has a hook-tip. [20]
Double-crested cormorant, Nannopterum auritum (B) Neotropic cormorant, Nannopterum brasilianum; Pelicans. American white pelican. Order: Pelecaniformes ...