Denmark has twice as many pigs as there are people.
66
When cats are happy, they may squeeze their eyes shut.
10
Bats sleep 18-20 hours per day.
5
Only 3% of bird species have penises.
0
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