Slippery dick (Halichoeres bivittatus)

The next funniest animal name is derived from the creature's slippery body. The fish coats its body in a mucus-like substance so that predators have a hard time grabbing onto it.

The slippery dick has three phases of growth and its appearance changes with each phase. Juveniles are white with a black lateral stripe. In its mid-phase, it becomes white-grey with two red stripes. At the terminal stage, the slippery dick turns green with dark stripes.