Humans and dolphins are the only species that have sex for pleasure.
61
The venom of the king cobra is so deadly that just one gram of it can kill 150 people.
76
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Butterflies taste with their feet.
30
Elephants are among the most emotional creatures in the world - they have even been known to rescue other animals, such as trapped dogs.
25
Beavers can swim half a mile underwater on one gulp of air.
31