One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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When cats are happy, they may squeeze their eyes shut.
10
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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Lurch, a Watusi bull, had the largest horns in the world.
32
The elephant brain weighs about 6,000g.
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