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Birds are feathered vertebrate animals that lay eggs. The majority of birds are capable of flying, although some are flightless. Often there are many different species of birds in a small area, even though there have been many species that have gone extinct over the years. Many people enjoy keeping exotic birds as pets. These birds are often colorful, so people enjoy having them in their homes so that they can look at their feathers. Many people also use birds as a food source. Chickens, turkeys, and ostriches are commonly raised on farms so that their meat can be sold to consumers.
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