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. They inhabit ecosystems across the globe, from the Arctic to the Antarctic.
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Amnh.org | | Amnh.org
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Annualreviews.org | | Annual Reviews - Welcome
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Audubon.org | | National Audubon Society
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Bbc.co.uk | | BBC - Homepage
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Biochemj.org | | Biochemical Journal - BJ Central
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Biologists.org | | the company of biologists limited
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Birdlife.org | | BirdLife International - conserving the world s birds
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Birdpop.org | | Institute for Bird Populations
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Blackwell-synergy.com | | 302 Found
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Bsc-eoc.org | | Bird Studies Canada
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Cambridge.org | | Cambridge University Press
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Cornell.edu | | Cornell University
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Digimorph.org | | Digital Morphology at the University of Texas
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Doi.org | | The Digital Object Identifier System
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Earth-policy.org | | Earth Policy Institute – Building a Sustainable Future | Home
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Eku.edu | | EKU - Eastern Kentucky University
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Handle.net | | HANDLE.NET - The Handle System
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Hbw.com | | Home | Lynx Edicions
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I-o-c.org | | 400 Bad Request
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Oxfordjournals.org | | Oxford Journals
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Rug.nl | | University of Groningen: a European university with a high reputation for academic teaching and research < Home RUG < University of Groningen
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Springerlink.com | | Springerlink.com
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