Dolphins have names for one another.
18
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
The Basenji dog is the only dog that is not able to bark.
4
Cats recognise the voice of their owner, but never evolved to care.
22