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Sep 18, 2014 4:44 PM

Killing Comes Naturally To Chimps, Scientists Say

For years, there have been two main theories about why chimpanzees, our closest evolutionary cousins, sometimes kill each other: One theory blames human encroachment on the chimpanzees' native habit in Africa. Another says that (male) chimps kill in the normal course of competition with rival groups.

A new study published in Nature appears to support the second theory.


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