A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
When a male honey bee climaxes during sex, his testicles explode and then he dies.
27
Rattlesnake mating sessions have been known to last more than 22 hours.
232
Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
19
Cats and dogs can hear ultrasound.
350
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Jellyfish as a species are actually older than dinosaurs and sharks.
383
