One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
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
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Penguins have a gland above their eye that turns saltwater into freshwater.
12
Cats recognise the voice of their owner, but never evolved to care.
22
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11