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
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
Jellyfish as a species are actually older than dinosaurs and sharks.
383
A lion in the wild usually makes no more than twenty kills a year.
186