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.
Bats and dolphins use echolocation to locate their food and navigate. They emit sound waves that bounce off objects in their environment, allowing them to interpret the returning echoes to determine the location, size, and shape of nearby objects, including prey. This sophisticated biological sonar system enables them to thrive in their respective habitats, whether in the dark of caves or the depths of the ocean.
Diffraction The answer is Echolocation.
echolocation
Echoes are used to locate objects through a process called echolocation, where sound waves are emitted and their reflections from nearby objects are analyzed. By measuring the time it takes for the sound waves to return, the distance to the object can be determined. This technique is commonly used by animals like bats and dolphins, as well as in technology like sonar and radar, which help identify the size, shape, and position of objects in their environment.
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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.