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Gorillas play "tag" in a similar way to humans, scientists have discovered.
By studying footage recorded in zoos, the team found that the great apes would hit a playmate and then run away, chased by the gorilla they had struck.
Occasionally, the roles would then reverse, with the chaser hitting back, and then getting chased.
The research, published in the journal Biology Letters, suggests the primates are testing the limits of acceptable behaviour within their social group.
The gorillas at San Francisco Zoo were observed over a period of five years playing with a variety of equipment.
The study found that gorillas like to keep games going and even give younger apes a fair chance to play.
"An older and more skilled gorilla seeming to realise that if it used all of its potential, the younger one wouldn't be able to compete, so the older gorilla would slow down the pace."
The scientists said this kind of shared activity and joint attention with another person begins around nine months of age in humans.