Some species of dolphins may come up to swimmers to play or out of curiosity. They are known to follow ships. They have been reported to aid swimmers in trouble. Humpback whales are not famous for doing the same. Orcas in the wild, while you can swim near them and no fatalities have been reported, you better be cautious around. Not that they are after you, it's just that their size and power means that curiosity can quickly turn into a serious situation. Some seals are relatively safe to have around. Leopard seals not so. Don't swim with bull sharks if you have no idea what you're doing. Sand tiger sharks rarely can be bothered with attacking anything larger than a haddock. In all cases, let the animal have its personal space unless it invites you in. Mutual respect for privacy goes a long way.
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