Wing covert feather, flight, Institute of Zoology and Zoological Museum, University of Hamburg.

翅膀隐羽，飞行用，汉堡大学动物学会和动物博物馆。

youdao

Wing covert feather, flight, Institute of Zoology and Zoological Museum, University of Hamburg.

翅膀隐羽，飞行用，汉堡大学动物学会和动物博物馆。

youdao