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How good is chimps' and bonobos' memory?

In this experiment, researchers studied apes' social memory. What do you think they discovered?

Apes recognize former caregivers Apes looked longer at previous groupmates than strangers Apes have detailed memory

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How did they figure that out?

What was the method used to test social memory in apes?

Brain scans Memory games Eye-tracking with images of former groupmates versus strangers

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And the results?

How long can apes remember their former groupmates according to the study?

Up to 5 years Up to 14 years Up to 26 years

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Why does that matter?

What is the evolutionary significance of this discovery?

Social memory is unique to bonobos Social memory is a recent development Social memory may date back to the last common ancestor of humans and apes

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