Class Aves: feathered, egg laying vertebrates with a beak and, in nearly every species, the capacity for flight. Covers songbirds, raptors, seabirds and the small number of flightless lineages such as ratites and penguins, which stay here because feathers and a beak are the defining trait, not flight itself.
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Sources
1. Wikipedia: Bird
WikipediaBird, lead sectionQuote, Bird, lead section
the laying of hard-shelled eggs
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