Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18
Condoms were originally made of animal intestines or linen.
347
The reindeer is the only mammal that can see UV light.
17
Jumping fleas can accelerate 50 times faster than the space shuttle.
218