Nurse sharks have smoother skin than most sharks, and feels like sandpaper.

Sometimes called the couch potatoes of the sea, nurse sharks are large, peaceful fish that slowly drift along the bottom of the ocean in shallow water, sucking up food as they go. They hunt alone at night but return to the same comfortable resting place during the day where they enjoy dozing in piles. Although their habitat is alongside humans, these fish are rarely harmful; they will only bite if startled or provoked. These gentle sharks are quite comfortable in zoo aquariums and can live up to 25 years in captivity.