A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Female canaries cannot sing.
14
Ducks will only lay eggs early in the morning.
36
The male gypsy moth can "smell" the virgin female gypsy moth from 1.8 miles away!
55
Slugs have 4 noses!
17
A cat's jaws cannot move sideways.
194
Only 3% of bird species have penises.
0
The venom of a small scorpion is much more toxic than the venom of a large scorpion.
60