Birds are warm blooded and egg laying vertebrate animals.They have two legs and wings.They fly in the sky through the help of wings. They live in the sky but they makes their nest in the land on trees.Some birds have no nest.Birds have approximately10000 existing classes.Birds are present all over the world.Birds live freely but some people caught them and lock it in their homes .Birds are of different types.They migrated if the weather is not suitable for them like some birds cannot survive in winter so they migrated to other places.As birds maintain high body temperature, they utilize many energy. For this they require food.
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