Are cetaceans a danger to humans?

Cetaceans are generally not dangerous to humans, although there have been rare instances in which humans have been injured by killer whales (orcas).  The main threat comes when humans swim or dive with cetaceans.  These are very large creatures and they can inadvertently harm a human.  Cetaceans, even large whales, like to mimic divers when they are comfortable with them and can swim quite close.