Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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Cats and dogs can hear ultrasound.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
A group of kittens is called a "kindle".
10
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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