小翼

Also, in all of these photos, you cannot see "hanging" alula or primary coverts often shown by Rook.

同时，所有的照片都看不到『悬挂起』的小羽或大覆羽，通常秃鼻鸦会有这。

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.

这小组还注意到，根附近铰接的副，称为小的，对成直角配置，它可能作为空气流量控制装置。