Travis was a chimpanzee who socialized with humans since birth. He could log onto a computer to look at pictures, watch TV using a remote control, brush his teeth, feed hay to his owner's horses, water plants, and learned the schedule of passing ice cream trucks.
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Cats recognise the voice of their owner, but never evolved to care.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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A group of unicorns is called a blessing.
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