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This is Scientific American 60-second science. I'm Cynthia Graber. Got a minute?

Imagine the evolutionary advantage of being able to hear a predator rustling in the tall grass nearby

or in the ability to hear a comrade making a ch-ch-sound to warn you about that predator. Now a study

finds that early human species may have had sharper hearing in certain frequencies

than we enjoy. The finding is in the journal Science advances.

We've been able to reconstruct an aspect of sensory perception in a fossil human ancestors

known as Australopithecus Afrikanus, and parenthesis robustus, from South Africa.

Binghamton University anthropologist Ralph Quam.

Both of these fossil forms lived about 2 million years ago and represent early human ancestors.

We took CT scans of the skulls.

We created virtual reconstructions on the computer of the internal structures of the ear that

will predict how an organism hears based on these

measurements of its ear.

And the reconstructed physiology reveals that those early homonyms likely heard differently than

both modern chimps and modern humans.

Specifically, the homonyms were probably more sensitive to frequencies associated with sounds

like tk, f, and s.

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