Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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The oldest recorded elephant lived for 82 years.
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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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The oldest creature ever found was Ming the clam at an admirable 507 years old.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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When dragonflies mate, their tails form a love heart.
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A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
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