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Sharks use sound to locate food. Sound is often the first sense a shark relies on to detect prey. Under water, sound travels farther and approximately 4.5 times faster than on land. Sharks are attracted to low-frequency pulsed sounds, similar to those wounded or ill prey would emit.
Sharks primarily use their sense of smell to locate prey in the water. They have an extraordinary ability to detect even small amounts of blood and other chemicals from their prey, sometimes from miles away.