Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
47
The seahorse is the only fish to have a neck.
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21