One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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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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The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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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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