A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
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Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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