Birds are warm-blooded vertebrate animals that have wings, feathers, a beak
no teeth a skeleton in which many bones are fused together or are
absent, and an extremely efficient,, one-way breathing system. Flying
birds have strong, hollow bones and powerful flight muscles.
Most
birds can fly. Birds have a very strong heart and an efficient way of
breathing - these are necessary for birds to fly. Birds also use a lot
of energy while flying and need to eat a lot of food to power their
flight.
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