A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
When dragonflies mate, their tails form a love heart.
22
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
Mosquitoes don't just bite you, they also pee on you.
11