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No, really, they have one of the smallest brains out of all mammals, and that’s in proportion to their body weight too!
Their restrictive diet of non-nutritious eucalyptus leaves may be the cause, as this diet couldn’t possibly sustain a larger brain.
To give you an idea of how clueless they are, when a koala is presented with a branch with leaves and a pile of leaves on a plate, they will eat the leaves on the branch as they cannot recognize those on the plate as food.
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