Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Only 3% of bird species have penises.
0
On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
71
Jumping fleas can accelerate 50 times faster than the space shuttle.
218