Condoms were originally made of animal intestines or linen.
347
Rattlesnake mating sessions have been known to last more than 22 hours.
232
Cows can sleep standing up, but they can only dream lying down.
745
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
One in three dog owners say they have talked to their pets on the phone.
427
There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11