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

The animal kingdom is crowded with species that use sound,

growls and bellows and roars to signal sighs.

Dogs do it.

Red deer do it.

Cowalas do it.

And now we can add humans to that list.

Because a new study suggests we can size up other people by the sound of their roar alone.

First, researchers took the circumference of 61 men's and women's biceps, measured their grip strength and their height.

Then, they told them to let

loose a roar. I've probably described it as the most hellish version of Groundhog Day that you

can think of. Jordan Raine, a behavioral ethologist at the University of Sussex. If you just imagine

30 actors in training coming into a small room one after another and roaring at you,

yeah, it was an experience, that's for sure.

His team then played those roars back to a separate group of male and female listeners,

who'd also been measured for strength and size.

They found that men correctly rated other men as substantially stronger than them,

...