One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Parrot parents "name" their children with a signature call.
112
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
A group of unicorns is called a blessing.
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