最終更新日：2024/07/30
The alula is a small feathered appendage found on the first digit of a bird's wing.
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The alula is a small feathered appendage found on the first digit of a bird's wing.
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The alula is a small feathered appendage found on the first digit of a bird's wing.
The alula is a small feathered appendage found on the first digit of a bird's wing.
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