最終更新日:2022/12/24
First, their feathers grow continuously over their bodies without the bare spaces (apteria) between tracts most other birds have. This condition is shared only by the ostrich, the penguins, and the colies.
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First, their feathers grow continuously over their bodies without the bare spaces (apteria) between tracts most other birds have. This condition is shared only by the ostrich, the penguins, and the colies.