Dolphins' interest in people is frequently based on curiosity. Diving, twisting, spiraling, and making unusual sounds underwater often succeed in attracting a dolphin's attention. Be playful and active in a non-aggressive way.
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The experiment revealed that dolphins are attracted to high-pitched frequencies of several musical instruments including the flute, piccolo, the Indian wooden recorder, and a high-pitch singing voice.
If a dolphin approaches you while you are swimming, do not reach out and try to touch him. These dolphins are wild animals and rarely tolerate physical contact from humans. Trying to touch or grab a dolphin is illegal and is virtually guaranteed to scare them away.