Sun, sea and swimming with dolphins: it sounded like the perfect holiday. While Billie Finley and her three fellow Americans were in Cancun, Mexico, last October, they visited an aquarium and paid to swim with the dolphins. One of the females was bleeding from injuries. The tourists were told she was in season and it was not unusual for dolphins to fight, but there was no risk to humans. But minutes into her session, Ms Finley was attacked by one of the six adult dolphins, which dragged her across the pool by her feet and slammed her against a wall. She almost drowned and suffered cuts.