Female kangaroos have three vaginas.
2
The seahorse is the only fish to have a neck.
12
Cows can sleep standing up, but they can only dream lying down.
745
The Basenji dog is the only dog that is not able to bark.
4
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 reindeer is the only mammal that can see UV light.
17