最終更新日：2024/08/06
The bird's uropygical gland produces oil to keep its feathers waterproof.
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The bird's uropygical gland produces oil to keep its feathers waterproof.
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The bird's uropygical gland produces oil to keep its feathers waterproof.
The bird's uropygical gland produces oil to keep its feathers waterproof.
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