Many sharks have tail fins with an upper lobe that is larger than the lower, which tends to push the head down. Sharks are known for their speed and maneuverability in the water. Sharks have five to seven gill slits and many sharks must keep moving in order to breathe. Sharks have a pointed snout that extends forward and over a crescentshaped mouth set with sharp triangular teeth. Only a few species, including the Great White, Mako, and Tiger sharks, have the large, fearsome teeth popularly thought of as typical of sharks.
Sharks have the same five senses as people.
They can see, hear, smell, taste, and touch. There is also a sixth sense that allows sharks to detect weak electrical signals generated by their prey. Smell is a shark's most acute sense. Approximately 70 percent of the shark's brain is used for smelling. Sharks' diets vary considerably and may include plankton, clams, crabs, sea turtles, fishes, seals, porpoises, and whales.