Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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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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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 a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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Cat families usually play best in even numbers. Cats and kittens should be acquired in pairs whenever possible!
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Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
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