Wing feather with copper-containing pigment, flight and display, Courtesy Peter Mullen, Ph.D.

带有铜类色素的翅羽，飞行和展示用，彼得·穆伦博士惠赠

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A tiny feathered "thumb," the alula, improves flight control. The protruding shaft on the first wing feather makes a loud, rustling sound—adding acoustics to the visual display.

微小的拇翼改善了对飞行的控制能力，第一翼羽上的凸出轴结构会发出沙沙的响声——在保持视觉效果的同时还增添了声学效果。

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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。

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