Flight feather

（重定向自Primary feather）

Red kite (Milvus milvus) in flight, showing remiges and rectrices

Primary (left) and secondary (right) feathers of the common buzzard (Buteo buteo); note the asymmetrical orientation of the shafts

Male mallard (Anas platyrhynchos) landing, showing outspread alulae

Male pin-tailed whydah (Vidua macroura) showing modified rectrices

Flight feathers (Pennae volatus) are the long, stiff, asymmetrically shaped, but symmetrically paired pennaceous feathers on the wings or tail of a bird; those on the wings are called remiges (singular remex) while those on the tail are called rectrices (singular rectrix). The primary function of the flight feathers is to aid in the generation of both thrust and lift, thereby enabling flight. The flight feathers of some birds have evolved to perform additional functions, generally associated with territorial displays, courtship rituals or feeding methods. In some species, these feathers have developed into long showy plumes used in visual courtship displays, while in others they create a sound during display flights. Tiny serrations on the leading edge of their remiges help owls to fly silently (and therefore hunt more successfully), while the extra-stiff rectrices of woodpeckers help them to brace against tree trunks as they hammer. Even flightless birds still retain flight feathers, though sometimes in radically modified forms.

单词	Primary feather
释义	Primary feather 原声例句科学60秒 2018年3月合集 When that eighth primary feather was missing, they very rarely responded. They almost never fled. 当没有第8根主翼羽时，鸟儿很少做出反应。它们几乎不会逃跑。科学60秒 2018年3月合集 So the eighth primary feather produced that high note and the ninth primary feather, it turns out, actually produced the low note. 所以，第8根主翼羽产生高音，而第9根主翼羽则产生低音。” 科学60秒 2018年3月合集 We were able to target the eighth primary feather, which is unusually narrow-it's about half the width of the surrounding feathers. “我们的研究对象是第8根主翼羽，这根羽毛非常窄，宽度约为周围羽毛的一半。科学60秒 2018年3月合集 And from this experiment we were able to see that the eighth primary feather, the unusual feather, was actually crucial for signaling alarm. “我们可以从这个实验中了解到，极不寻常的第8根主翼羽是发出警报声的关键。英语百科 Flight feather （重定向自Primary feather） Flight feathers (Pennae volatus) are the long, stiff, asymmetrically shaped, but symmetrically paired pennaceous feathers on the wings or tail of a bird; those on the wings are called remiges (singular remex) while those on the tail are called rectrices (singular rectrix). The primary function of the flight feathers is to aid in the generation of both thrust and lift, thereby enabling flight. The flight feathers of some birds have evolved to perform additional functions, generally associated with territorial displays, courtship rituals or feeding methods. In some species, these feathers have developed into long showy plumes used in visual courtship displays, while in others they create a sound during display flights. Tiny serrations on the leading edge of their remiges help owls to fly silently (and therefore hunt more successfully), while the extra-stiff rectrices of woodpeckers help them to brace against tree trunks as they hammer. Even flightless birds still retain flight feathers, though sometimes in radically modified forms.
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