One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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An average cat has 1-8 kittens per litter and can have 2-3 litters per year. During her productive life, one female cat could have more than 100 kittens. A single pair of cats and their kittens can produce as many as 420,000 kittens in just 7 years.
10
Hummingbirds can weigh less than a penny!
12
Racehorses can wear out new horse shoes in one race.
38
Cats sleep for 70% of their lives.
8
Rats multiply so quickly that in 18 months, two rats could have over a million descendants.
33
A hedgehog's heart beats 300 times a minute on average!
14
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109