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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Rock wiki:
ay refer to:GeologyRock (geology), a substance composed of minerals.An islet, specifically, one that is small and with minimal soilA gemstone (slang), usually understood to be a diamondRock salt, an unrefined form of sodium chloride
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