A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A cow produces 200 times more gas a day than a person.
90
Billy goats urinate on their own heads to smell more attractive to females.
31
A 4-foot walrus penis bone sold at auction in 2007 for $8,000.
202
When you correct for weight differences, men are proportionately stronger than horses.
64
When you shave a guinea pig it looks like a little hippo.
19
A full-grown bear can run as fast as a horse.
35
A group of kangaroos is called a mob.
28