MSH: Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves.,CSP: warmblooded oviparous tetrapods with feathers, one occipital condyle, forelimb modified into wings, heart with 2 ventricles.,NCI: A taxonomic class of egg-laying, endothermic vertebrates. The forelimbs of these bipedal animals have been modified to form wings. Modern birds have beaks with no teeth and their bodies are covered in feathers.

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