Dolphins are predators that hunt in pods, which are groups of dolphins that work together to find and catch prey. When hunting stingrays, dolphins will often use their echolocation abilities to locate the stingrays in the water. They will then use their powerful tails to stun the stingrays and make them easier to catch. Dolphins will also sometimes use their teeth to bite the stingrays' tails, which can paralyze the stingray and make it even easier to catch.
Stingrays are not the only type of prey that dolphins eat. They will also eat other types of fish, squid, and crustaceans. The diet of a dolphin will vary depending on the species of dolphin and the location in which it lives.