Here's a few more:
Hummingbirds can't walk.
Americans on average eat 18 acres of pizza every day.
Adolph Hitler was a vegetarian, and had only 1, and i repeat, ONE, testicle.
You're born with 300 bones, but when you get to be an adult, you only have 206. (apparently they fuse together such as the parietal, occipital of the skull).
Human thigh bones are stronger than concrete.
The only jointless bone in your body is the hyoid bone in your throat.
Bats always turn left when exiting a cave.
You can't kill yourself by holding your breath.
There is more bacteria in your mouth than the human population of U.S and Canada combined
The Burramundy, a fish, grows up as a male, but after 2 years or so, it turns into a female to breed.
If Barbie were life-size, her measurements would be 39-23-33. She would stand seven feet, two inches tall and have a neck twice the length of a normal human's neck
Cat's urine glows under a black-light. (But did you reeeeally want to know this?)
Cats have over one hundred vocal sounds, dogs only have about ten.
Cats have 32 muscles in each ear
(there are tons more, and I will post more later.. this is just a randome few, only through "C", at that.
