All Names of Flightless Birds?

Answer

A flightless bird is a bird that cannot fly. They can however run or swim. Flightless birds usually have smaller wing bones and they lack keel on their breastbone.
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Ask.com Answer for: what is a flightless bird
Not all birds can fly. Several kinds of birds are flightless, such as penguins, ostriches and emus. Flightless birds have smaller wing bones and have a reduced or absent keel--a chest bone that flight muscles attach to.
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