The following outline is provided as an overview of and topical guide to birds:
Birds (class Aves) – winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most varied of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic, to the Antarctic. Extant birds range in size from the 5sigfig=1NaNsigfig=1 bee hummingbird to the 2.75sigfig=1NaNsigfig=1 ostrich.
A bird can be described as all of the following:
Bird
Bird behavior
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