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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Charles Darwin is most famous for his finches,

from whose beaks he gleaned the idea that a single species might radiate into many.

But he studied other attributes of birds, too,

like the rhythmic sounds some species made during courtship

by fluttering, shaking, or rattling their feathers

together.

Since Starwing, there has been this fact that birds produce sounds with wings and tails

or flight feathers. So there are species of mannequins that do these sounds, and there's

hummingbirds that do the sounds.

Valentina Gomez-Bahamon is an evolutionary biologist and ornithologist at the Field Museum in Chicago.

She and her team have now observed that non-vocal sound production phenomenon in another type of bird,

the fork-tailed flycatcher.

The researchers studied two groups of the birds in South America and recorded the birds making

these fluttering sounds with their wings during morning courtship rituals and in combat between males.

One of the two flycatcher subspecies is migratory. The other stays put. And by carefully measuring

the bird's feathers, the research team found that the migratory birds had longer, thinner feathers,

...