One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Penguins have a gland above their eye that turns saltwater into freshwater.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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The cat brain weighs about 30g.
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Cats recognise the voice of their owner, but never evolved to care.
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There's a competition in Sweden called Kaninhoppning, or rabbit show jumping.
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