To impress females, Costa's hummingbirds 'sing' with their tail feathers

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Male Costa’s hummingbirds perform a high-speed dive during which they ‘sing’ to potential mates using their tail feathers. Males perform their dives to the side, rather than in front of females. UC Riverside researchers used an acoustic camera to find out why. The results are published in Current Biology. They showed that sideways dives allow males to hide the speed of their dives, perhaps enabling them to appear faster than they really are.



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