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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 ... Birds possess distinct characteristics that make them one of the most distinguishable group of vertebrates. The following characteristics are unique to birds:
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animals.about.com/od/birds/p/aves.htm
animals.about.com/od/birds/p/aves.htm
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Definition: A taxonomic group (class) of vertebrates, also known commonly as birds, whose distinguishing characteristics include feathers, endothermy, and the production of amiotic eggs. Birds evolved from reptiles during the Mesazoic Era about 150 million years ago. ... Birds - Class Aves...
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animals.about.com/cs/birds/g/Aves.htm
animals.about.com/cs/birds/g/Aves.htm
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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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flightless birds are secondary ... bones are light and honey combed ... toothless, but have beak...
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wellspring.isinj.com/bio/principlesI/webfiles/Biol201le...
wellspring.isinj.com/bio/principlesI/webfiles/Biol201lect/Lecture35/slide08.htm
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This requires a lot of energy and lots of special physical characteristics. Almost all birds have feathers, which are made of keratin (the same substance that makes hair and fingernails). Hollow bones are another characteristic needed for flight. ... Class Aves...
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www.thebigzoo.com/zoo/Aves.asp
www.thebigzoo.com/zoo/Aves.asp
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Birds (class Aves) are bipedal, warm-blooded, vertebrate animals that lay eggs. There are around 10,000 living species, making them the most numerous tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic.
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answers.yahoo.com/question/index?qid=20080301111417AALm...
answers.yahoo.com/question/index?qid=20080301111417AALmE6L
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• Late Triassic deposits in Texas • Fossil more similar to modern birds • If really an ancestor would change thinking about bird origins • HOWEVER • bones not found in an articulated skeleton • may be a mixture of two or more different animals ... Characteristics of Birds...
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www.d.umn.edu/biology/courses/bio3701/Birds.htm
www.d.umn.edu/biology/courses/bio3701/Birds.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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Other authors have treated Avialae as defined by Gauthier as a synonym of Aves. [clade] ... The animal is identified as a dinosaur rather than a bird based on a list of distinctive features, but most importantly, a skull with a bony bar behind the eyes (not found in birds) and other theropod characteristics.
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www.dinosauria.com/dml/names/aves.htm
www.dinosauria.com/dml/names/aves.htm
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