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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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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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Birds are vertebrates, with a backbone and skeleton, although some of the bones are hollow to keep the bird light. Their forelimbs have the same bones as the human arm, but they are highly modified to form the structure for wings.
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www.sandiegozoo.org/animalbytes/a-birds.html
www.sandiegozoo.org/animalbytes/a-birds.html
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Discover Life's encyclopedia page about the biology, natural history, ecology, identification and distribution of Vertebrata: Aves - Birds ... Chordata -- Chordates; Aves -- Birds; Neornithes -- Living birds;
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www.discoverlife.org/20/q?search=Aves
www.discoverlife.org/20/q?search=Aves
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Scientific background and information on birds. ... 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. ... Click on the buttons below to learn more about birds.
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www.ucmp.berkeley.edu/diapsids/birds/birdintro.html
www.ucmp.berkeley.edu/diapsids/birds/birdintro.html
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The consensus view in contemporary paleontology is that the birds, Aves, are the closest relatives of the deinonychosaurs, which include dromaeosaurids and troodontids. Together, these three form a group called Paraves.
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www.answers.com/topic/bird
www.answers.com/topic/bird
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Cracraft, J. 1981. Toward a phylogenetic classification of birds of the world (class Aves). Auk 98: 681-714. ... 2007. Higher-order phylogeny of modern birds (Theropoda, Aves : Neornithes) based on comparative anatomy. II. Analysis and discussion. Zoological Journal of the Linnean Society 149(1):1-95.
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tolweb.org/tree?group=Neornithes&contgroup=Aves
tolweb.org/tree?group=Neornithes&contgroup=Aves
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Aves, Birds. Johnston, Alexander Keith, 1804-1871, 1856; ; View larger, zoomable image (turn off pop-up blocker) ; ... Geographical division and distribution of the birds of Europe from the latest authorities by A.K. Johnston, F.R.G.S. Geographical division of Aves, birds, over the world. Engraved by W. & A.K. Johnston.
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www.davidrumsey.com/maps940055-24716.html
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Birds lay eggs which they generally incubate. On hatching from the egg, young either leave the nest (i.e. are nidifugous) or are provided with food by their parents until they become independent (i.e; are nidicolous).
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www.inra.fr/Internet/Produits/HYPPZ/ZGLOSS/6g---096.htm
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