To understand the impacts on dolphins, his team monitored the response of pods off the coast of California as sonar devices were dipped into the sea at specific locations by military helicopter.

The system, from Dolphin Alarms, consists of three pieces: a wristband that a child wears, an alarm stationed in the pool and an alarm that goes off in one's home should an accident occur.

raw sewage and noise pollution from ships that interfere with the dolphins’ sonar. This combination causes chronic stress, which impacts the dolphins’ immunity and reproductive systems ...

Sonar systems engineered by humans use a similar principle. Au and Benoit-Bird find that echolocating dolphins also use gain control to maintain a consistent signal — but rather than adjusting ...

The Amazon river dolphin uses sonar and its wing-like pectoral fins to navigate the murky waters of the flooded forest. Each time Thomas was in the water with them, he was impressed by their ability ...

Sonar, used by warships to find submarines, is deafening to dolphins and their desperation to escape the noise can result in them surfacing too fast or beaching themselves. The institute also said ...