What I think your referring to is called echolocation.This is when a dolphin makes a clicking noise that produces vibrations, which reflect off of whatever they touch, and the dolphin reads these signals. It lets the dolphin know how far away food is, or how close the nearest object is.
It is animals's inner ability to capture infraosound through thier ears . Nature has enabled animal to prey through using this smethod during night and day making them to survive in the wild.
Bats and Dolphins both use sound to navigate.
Echolocation
they use echolocation
Yes, dolphins use sound, which is a kind of vibration, to speak, and also to navigate by means of sonar.
dolphins use ecolocation. which is a sound they make and when the vibrations of the sound bounce off an object . the dolphins can tell how far away from the object they are. they use this because they have very poor eyesight.
Ultrasound
bats dolphins whales
dolphins send out a click that bounces off of other objects near them. The longer the time to get the vibrations back to the dolphin is how far away the object is in front of them.
dolphins kind of have xray vision they use sound waves and feel what comes back
because is dark in the sea, so the dolphins can't see. the dolphins use ultra sound to navigate and to hunt for pray, like a bat does.
bats and dolphins use sound refraction to hunt for food. the bat is blind so they have to use sound refraction.
by infra sound....