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This is Scientific Americans' 60-second science. I'm Karen Hopkins. This will just take a minute.

What does panic sound like? Like that for sure, but also like this. And this.

But maybe you already knew that, because a new study shows that humans are actually good at identifying vocalizations

that are emotionally intense, even when those outcries come from other species. The findings

are communicated in the proceedings of the Royal Society B. It was Charles Darwin who first mused

about the evolution of emotional expression. As he wrote in the descent of man,

All the air-breathing vertebrata necessarily possess an apparatus for inhaling and expelling air.

When the primeval members of this class were strongly excited and their muscles violently contracted,

purposeless sounds would almost certainly have been produced.

Now, if producing those seemingly purposeless noises turned out to be beneficial,

by warning others of predators, summoning protection or enticing a mate, the behavior would persist,

and over time become selected for. Of course, for that to happen, the meanings behind those utterances

would have to be clearly understood.

To explore this question, researchers asked 75 volunteers to listen to vocalizations produced by nine different species,

from black-capped chickadees to American alligators.

The recordings included sounds made by animals when they were relatively relaxed,

like this hourglass tree frog,

...