A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
The oldest creature ever found was Ming the clam at an admirable 507 years old.
16
Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
47
Penguins have a gland above their eye that turns saltwater into freshwater.
12