In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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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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Dogs sometimes fake being sick to get attention.
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Early American humans hunted car-size armadillos and used their shells for houses.
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A giraffe's kick is so powerful that it can decapitate a lion.
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