A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18
There are approximately three chickens for every human on Earth.
13
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 42-foot sperm whale has about 7 tons of oil in it.
209
Rattlesnake mating sessions have been known to last more than 22 hours.
232
Jellyfish as a species are actually older than dinosaurs and sharks.
383