Condoms were originally made of animal intestines or linen.
347
Jellyfish as a species are actually older than dinosaurs and sharks.
383
The octopus does not have a blind spot.
273
The most expensive cow in the world was sold in 2009 for $1.2 million.
-3
Dogs sometimes fake being sick to get attention.
26
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13