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Hammerhead sharks are fearsome looking beasts that patrol the waters in which they live as if they have no fear of anything in the ocean. It's not surprising that they are so confident considering the fact that they have highly evolved vision and sensory organs that make them especially capable hunters. Unlike most shark species, hammerheads school in groups of more than 100 individuals by day, although they are solitary at night when they are hunting. Often seen in large congregations in areas such as this one, in the Galapagos Islands, they drift slowly on the current. This is a magnificent sight to see and scuba divers come from all over the world to swim among these awe inspiring animals. Always in motion, most species of shark lack a swim bladder and they must constantly move to stay off the bottom. They are also able to breathe more easily as the movement causes greater water flow over their gills.