There wasn't a single pony in the Pony Express, just horses!
57
Racehorses can wear out new horse shoes in one race.
38
Only male fireflies can fly.
46
When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
23
Dolphins sleep with one eye open!
52
Sloths take two weeks to digest their food.
243
Giraffes are unable to cough.
50