bird wiki:
>For other uses, see Bird (disambiguation). Many - see section below. Birds are bipedal, warm-blooded, egg-laying vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. Birds range in size from the tiny hummingbirds to the huge Ostrich and Emu. Depending on taxonomic viewpoint, there are about 8,800â10,200 living bird species (plus about 120â130 that have become extinct in the span of human history) in the world, making them the most diverse class of terrestrial vertebrates.
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Art wiki:
[hree-letter%20acronym">three-letter acronym that can mean:Adaptive resonance theoryAdvanced Rapid Transit metro technologyassisted reproductive technologyAnaheim Resort TransitIATA airport code for Watertown International AirportISO 639 alpha-3 code for otherwise unassigned artificial languagesThe National Rail code for Arrochar and Tarbet railway station, United Kingdom. External links: ; ; . Antiretroviral therapy. It is used in the treatment of HIV infection.
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