When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
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Cats recognise the voice of their owner, but never evolved to care.
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