Cows can sleep standing up, but they can only dream lying down.
745
Two dogs were among the Titanic survivors.
262
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12