Scientists believe that play behavior teaches the young dolphins the skills they will need to socialize, hunt, mate, and survive as adults. Even as adults, dolphins never seem to lose their interest in playing. Ingrid Visser, a student at the University of Auckland, watched as 19 orcas pursued 55 stingrays. Plowing into them from below, the orcas tossed the stingrays up into the air and batted to other orcas like Frisbees. Dolphins make a wide array of sounds, including clicks, moans, chirps,creaks, barks, squeaks, yaps, mews, and whistles.
Dolphins use clicking noises in echolocation, which bounce off objects underwater.
This allows them to navigate, identify prey and friends, and avoid obstacles and predators. Dolphins use whistles to maintain contact within their pod or when meeting other pods of dolphins. Their whistles may signal danger, a call for help, or simply identification. Scientists think that each dolphin has its own signature whistle, sort of like our names. Whistles may also help dolphins hunt cooperatively and coordinate migratory movements.