Condoms were originally made of animal intestines or linen.
347
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
The seahorse is the only fish to have a neck.
12
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
Cows can sleep standing up, but they can only dream lying down.
745