A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
Gorillas can catch human colds and other illnesses.
205
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
9
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20