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
When a male honey bee climaxes during sex, his testicles explode and then he dies.
27
Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
16
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45