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Bird. Birds are a group of warm-blooded vertebrates constituting the class Aves ( / ˈeɪviːz / ), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
List of birds. Penguins. Ostriches. This article lists living orders and families of birds. The links below should then lead to family accounts and hence to individual species. The passerines (perching birds) alone account for well over 5,000 species. In total there are about 10,000 species of birds described worldwide, though one estimate of ...
In this list of birds by common name, a total of 10,976 extant and recently extinct (since 1500) bird species are recognised. Species marked with a "†" are extinct. Species marked with a "†" are extinct.
Several common birds in the United States, such as the house sparrow, the rock pigeon, the European starling, and the mute swan are introduced species, meaning that they are not native to North America, but were brought there by humans. Introduced species are marked as (I). In addition, many non-native species which have individual escapees or ...
The Birds Portal. Birds are a group of warm-blooded vertebrates constituting the class Aves ( / ˈeɪviːz / ), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
These birds are adapted to an aquatic existence with webbed feet, flattened bills, and feathers that are excellent at shedding water due to special oils. American black duck, Anas rubripes LC. American wigeon, Mareca americana LC. Baikal teal, Sibirionetta formosa (A) LC.
Birds are bipedal, warm-blooded, egg-laying vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. This category contains taxa at the order or higher level in the class of Aves . For individual species of birds, see the subcategories, particularly category:Birds by classification and category:Birds by ...
Origin of birds. The scientific question of within which larger group of animals birds evolved has traditionally been called the " origin of birds ". The present scientific consensus is that birds are a group of maniraptoran theropod dinosaurs that originated during the Mesozoic Era . A close relationship between birds and dinosaurs was first ...