The animals emit a sound wave that bounces off an object and returns ... the inner ear of three specimens of the now extinct dolphin genus Parapontoporia from the collections of the San Diego ...

However, the sound waves used are within normal hearing range ... submarines and shoals of fish. Bats and dolphins use a similar method called 'echolocation' to detect their surroundings and ...

Sound is essential for communication and sensing in dolphins, so anything that disrupts ... These systems have been around for decades and use sound waves to detect underwater features and objects ...

Local officials put up warning signs and set up buoys that emit ultrasonic sound waves to ward off dolphins, as they rely on echolocation. The Coast Guard warns against approaching dolphins and to ...