One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Only 3% of bird species have penises.
0
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
492
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4