Sharks have highly sensitive eyes that can see extremely well in dim light. Sharks even possess a crude form of color vision. However, they may not be able to see details clearly. It was once widely believed that sharks relied mainly on their sense of smell to hunt prey. However, little evidence exists of a special sensitivity for smells in sharks.
Sharks can detect incredibly small electrical fields.
The head of a shark has a large number of small pores that lead to an elaborate system of sensory tubes. These tubes, called ampullae of Lorenzini, are sensitive to electrical fields. Sharks can locate and capture a fish by sensing the small electrical field produced by its gills. Sharks also seem to use their electrical sense for navigation and migration. Sharks belong to a group of fishes known as elasmobranchs.