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

Songbirds produce a rich repertoire of sounds. Songs, of course, but also chatter calls,

flight calls, and alarm calls, like this high-pitched warning from a black-capped chickadee.

But chickadeys aren't the only ones endowed with chirping abilities. Turns out a certain type of caterpillar can too.

Once again, here's the bird and then the caterpillar.

Sounds pretty darn similar.

Yeah, that's pretty crazy.

Jessica Lindsay is a biologist at the University of Washington.

She says this species, the North American Walnut Sphinx Caterpillar,

makes the sound using tiny pairs of breathing holes called spiracles.

They compress themselves lengthwise like an accordion, and so that compression pushes air out

of that spherical, making whistling sounds.

A cool coincidence for sure, but here's where it gets interesting.

Lindsay then played the caterpillar whistle through a speaker near a bird feeder, and the birds of many different species

ducked for cover. Sometimes we would see little nut hatches flicking their wings, and that's a big

signal of distress for them. And sometimes it would take a really long time to return to feeding, which is a

big indicator that they were taking that whistling noise pretty seriously. And whereas the birds

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