One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Gorillas can catch human colds and other illnesses.
205
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
22
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
A cow produces around 200,000 glasses of milk in her lifetime.
373