Cats sleep for 70% of their lives.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Parrot parents "name" their children with a signature call.
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A 42-foot sperm whale has about 7 tons of oil in it.
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A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
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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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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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