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This is Scientific American 60 Second Science.

I'm Mark Stratton.

Just imagine it chatting to a chimp in chimpanzee.

Whether portrayed by Rex Harrison, Eddie Murphy or Robert Downey Jr. Dr. Doolittle learned to talk to animals.

But in reality, science has remained some distance from solving the long-standing question of how

we humans learn to talk during our evolution. Here's one new clue. A team of researchers in

Great Britain have demonstrated how the rapid succession of opening and closing mouth rhythms

by chimpanzees, known as lip-smacking, mimics the natural pace of human mouths talking.

The findings are in the journal Biology Letters.

This phenomenon has been observed before in other ape species who perform lip-smacking movements at around 5 hertz,

which falls within a range of mouth opens and closes,

characteristic of all spoken languages, namely between 2 and 7 hertz.

But this lip-smacking timing connection had not been made in our closest evolutionary relatives,

until now.

Mouth and vocal signals with speech-like rhythm had already been observed in some monkeys,

in gibbons, and orangutan was one of our closest great-ape relatives. So the last years had

...