singing with the wings

it is hard to believe but some birds can actually sing with their wings!
the club-winged manakin has very dense, large, solid wing bones, and by rubbing its wings together iN a super fast speed, it could create a unique, violin-like sound! these birds would perform these special songs to attract the females.

怎樣用翅膀唱歌?梅花翅嬌鶲的翅膀,有比其它鳥更大更稠密的骨頭。牠們能透過極速摩擦羽毛,發出很獨特、像小提琴的音調來吸引雌鳥。

http://www.bbc.co.uk/nature/18461623

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