Birds are famous for having hollow bones - which make them incredibly light and allow them to fly. Pigeons have quite a bit of plumage, making them one of the heavier birds for their size. Their feathers are so heavy, in fact, that they are heavier than their hollow bones. Pigeons are still able to fly, however, because they are still light and have surprisingly large wings. They tend to only fly shorter distances and to walk a fair amount.
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