Dolphins make a wide range of sounds, varying from clicks, moans, squeaks, barks, and whistles. These sounds have different uses: the clicks are used for echolocation to navigate and find prey ,and the whistles to find each other, stay in contact, and signal danger.
Whales also use a clicking sound for echolocation, but may not use it all the time, which could account for run-ins with large objects like boats. They also make a variety of different noises including moans, roars, and squeals. These sounds re used for communication among whales. You can listen to these sounds by clicking the second link below.
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