Their bodies are long and slender, allowing them to swim fast, and lunge at their prey with amazing speed. Sharks have several rows of teeth that are continuously growing and replacing older teeth that fall out. This helps the shark keep a full set of sharp teeth at all times. Remoras have a unique head that acts like a suction cup, allowing the fish to stick onto sharks and get a free ride. Scientists think these specialized fishes act like a vacuum cleaner, by cleaning parasites off sharks, and eating bits of food and flesh created when sharks chomp down on their prey.
Sharks have electric sensory perception, from small sense organs in the pores of their nose.
These pores detect weak electrical impulses produced by prey and by the earth's magnetic field. Scientists believe sharks use this sense like a radar to target prey, and as a compass to travel long distances in the open ocean. There are over 350 species of sharks in the oceans of the world. Sharks live all over, from the cold polar waters to the warm tropical seas. Unfortunately the average person is more likely to drown than to even SEE a shark, let alone be attacked by one.