The scientific class that includes all birds, characterized by feathers, hollow bones, and the ability to lay eggs.
From Latin 'avis' meaning 'bird,' the plural form 'aves' became the formal taxonomic classification used in modern biology since the 18th century.
Aves is a Linnaean class containing over 10,000 living species, from hummingbirds weighing less than a penny to ostriches weighing 300 pounds—all united by their shared avian ancestry from theropod dinosaurs!
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