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are bipedal, warm-blooded , oviparous (egg-laying) vertebrates characterized primarily by feathers , forelimbs modified as wings , and a bony beak without teeth. common characteristics of birds include the laying of hard-shelled eggs , high metabolic rate, and a light but strong skeleton, generally with
hollow bones. the only animals covered with feathers, most birds are characterized by flight. many birds migrate long distances to utilize optimum habitats (e.g., arctic tern), while others spend almost all their time at sea (e.g., the wandering albatross). some, such as frigatebirds, stay aloft for...
https://www.newworldencyclopedia.org/entry/Bird