When it comes to friendships, chimpanzees become choosier as they age, must like humans do, a study in Science suggests. Chimpanzees, like humans, narrow their social circles, preferring to spend time with other chimpanzees that they've known for long periods of time, while younger chimpanzees were more likely to have more one-sided relationships, according to more than 20 years of observations at a national park in Uganda.
Aging chimpanzees more selective about social circles
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