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Sea turtles can see well underwater but are short sighted in the air. Under experimental conditions, loggerhead and green sea turtle hatchlings exhibited a preference for near-ultraviolet, violet, and blue-green light.
A person's outer ear is shaped to help draw sounds in toward the outer ear, but turtles have no outer ear. They have thin flaps of skin covering internal ear bones. The skin flaps allow vibrations and low-frequency sounds in the ear canal. So the turtles can hear to some extent, but their hearing isn't sensitive.
Most researchers believe that sea turtles have an acute sense of smell in the water. Experiments show that hatchlings react to the scent of shrimp. This adaptation helps sea turtles to locate food in murky water. A sea turtle opens its mouth slightly and draws in water through the nose. It then immediately empties the water out again through the mouth. Pulsating movements of the throat are thought to be associated with smelling.
A sea turtle is sensitive to touch on the soft parts of its flippers and anywhere on its shell. While the skin of a sea turtle is leathery, it is still very sensitive. Tame sea turtles might enjoy receiving a neck rub, for instance. Sea turtles can feel your hand on their shells. A series of nerves under the surfaces of their shells enable them to know when you are touching their shells.
Little is known about the sea turtles sense of taste. And all I could find was this. Some turtle species have taste buds that give them the ability to taste their food as they eat it, but other varieties lack taste buds. Sea turtles, or chelonians, are among those with taste buds.