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The vertebrate class Aves includes the birds, an extremely distinctive and successful clade, with an estimated 9000 species worldwide, including the snowy owl pictured here. Although descended from the dinosaurs, birds have evolved remarkable specializations for flight: a unique "one-way" breathing system,
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www.ucmp.berkeley.edu/diapsids/birds/birdintro.html
www.ucmp.berkeley.edu/diapsids/birds/birdintro.html
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Bird - Wikipedia, the free encyclopedia
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Birds (class Aves ) are winged, bipedal, endothermic (warm-blooded), vertebrate animals that lay eggs. There are around 10,000 living species, making them the most numerous tetrapod vertebrates. Th...
en.wikipedia.org/wiki/Bird
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Diapsida (birds, crocodiles, lizards, snakes, and relatives) ... Class Aves (birds) ... Home Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Aves...
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animaldiversity.ummz.umich.edu/site/accounts/classifica...
animaldiversity.ummz.umich.edu/site/accounts/classification/Aves.html
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Birds (Class Aves) are warm-blooded (endothermic) vertebrates. Birds have feathers covering their skin and their forelimbs are modified into wings. ... Birds - Class Aves...
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animals.about.com/od/birds/p/aves.htm
animals.about.com/od/birds/p/aves.htm
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Birds are members of the Class Aves. ... The major characteristics of this class concern adaptations for flight, including appendages modified as wings, feathers, endothermy, a high metabolic rate, a vertebral column modified for flight, and bones that are lightened by numerous air spaces.
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www.snow.edu/allans/biology1320/aves.html
www.snow.edu/allans/biology1320/aves.html
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Compared to other classes, birds are fairly uniform. For example, the weight of the largest of the flying birds usually reaches only 33 pounds, just 6,600 times the weight of the smallest birds. Most birds have the ability to fly. ... Class Aves...
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www.thebigzoo.com/zoo/Aves.asp
www.thebigzoo.com/zoo/Aves.asp
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Choose a group from the table below: ... Quetzals and Trogons ... Hummingbirds and Swifts...
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www.angelfire.com/mo2/animals1/bird/bird.html
www.angelfire.com/mo2/animals1/bird/bird.html
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