A killer whale's heart beats 30 times a minute under water, 60 times a minute on the surface.
30
Tigers have striped skin, not just striped fur!
78
Jellyfish as a species are actually older than dinosaurs and sharks.
383
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Roosters can't crow if they can't fully extend their necks.
28
Mosquitoes don't just bite you, they also pee on you.
11
Only 3% of bird species have penises.
0
No one has ever been able to domesticate the African elephant. Only the Indian elephant can be trained by man.
39