Well they can see. They also use echo location of sorts aswell though.
Something called echo-location
dolphins bats porpoises and whales
Dolphins use echolocation to navigate and communicate in their underwater environment because it helps them locate objects, find food, and communicate with other dolphins by sending out sound waves that bounce off objects and return to them, providing information about their surroundings.
Sonar is a system that locates objects by transmitting sound waves and detecting the waves when they are reflected off of objects. Bats and many other animals, such as whales and dolphins, use natural sonar to navigate and capture
Bats - and dolphins. They both use sound waves to find food.
Dolphins emit high-frequency sound waves that bounce off objects and return as echoes. By analyzing these echoes, dolphins can determine the size, shape, and distance of objects such as fish in their environment. This process, known as echolocation, helps dolphins navigate, hunt, and communicate with each other.
Diffraction The answer is Echolocation.
echolocation
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Some animals that use sonar include bats, dolphins, and whales. They emit sound waves that bounce off objects in their environment, allowing them to navigate and locate prey.
Bats use echolocation, emitting high-frequency sound waves that bounce off objects and return to their ears, helping them navigate and locate prey. Dolphins also use echolocation by producing clicks and listening to the echoes to determine the location, size, and shape of objects in their environment.
dolphins make sort of high-pitched shrieking noises. when they send out their sound waves, the waves bounce off objects near the dolphins and come back to the dolphin, which is how they locate prey without their eyes. this is called echolocation, and is also used by bats. the sounds of dolphins are really quite beautiful if you ever get the chance t ohear them