Popular Science - USA (2020 - Spring)

SPRING 2020 / POPSCI.COM

Lefties are an oddity among

humans. Only about 1 in 9 of us

use that hand, but my research on pri-

mates has found that in bonobos and

chimps, the split is more even: About

1 in 3 default left. For orangutans, 2 in

3 individuals are left-handed.

When I first started working with

chimp colonies, I was mostly recording

the mitts they used for tools. But some

of them, perhaps out of frustration,

would aggressively hurl poop at me. I

remember thinking that if I’m going to

much bigger actions like throwing.

aren’t born with a dominant side. On

think their echoes still influence us.

as

(^) t
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ar
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switching hands
WILLIAM HOPKINS, PROFESSOR
OF COMPARATIVE MEDICINE AT
THE UNIVERSITY OF TEXAS
MD ANDERSON CANCER CENTER
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