A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A lion in the wild usually makes no more than twenty kills a year.
186
Starfish don't have brains.
132
Bluebirds cannot see the color blue.
40
A killer whale's heart beats 30 times a minute under water, 60 times a minute on the surface.
30
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
A rodent's teeth never stop growing.
16
A baby octopus is about the size of a flea at birth.
40