Avialae Class: Aves Linnaeus, 1758[1] Subclasses †Archaeornithes * †Enantiornithes †Hesperornithes †Ichthyornithes Neornithes And see text Birds (class Aves) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. With around 10,000 living species, they are the most speciose class of tetrapod vertebrates. All present species belong to the subclass Neornithes, and inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size…
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