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Birds are a class of vertebrate, temperature-regulating animals that walk, hop, or stand on only their hind limbs,3 while the forelimbs have evolved into wings which, along with other unique anatomical features, give them they allow most of them to fly, although not all of them do. They have a body covered with feathers and, in birds sensu stricto, a conical beak without teeth. To reproduce, they lay eggs that incubate until they hatch.