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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The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
The elephant brain weighs about 6,000g.
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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.
9
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
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