Also, in all of these photos, you cannot see "hanging" alula or primary coverts often shown by Rook.
，所有的照片都看不到『悬挂起来』的小
羽或大覆羽，通常秃鼻鸦会有这个特徵。
Also, in all of these photos, you cannot see "hanging" alula or primary coverts often shown by Rook.
，所有的照片都看不到『悬挂起来』的小羽或大覆羽，通常秃鼻鸦会有这个特徵。
The team also noted a hinged flap near the base of the wing, called an Alula, which is deployed at right angles to the wing, which may be being used as a air flow-control device.
这个小组还注意到，根附近铰接的副，被称为小的，对
直角配置，它可能被用来作为空气流量控制装置。
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