However, only 20 perished during that incident, with rescuers managing to return the rest to the sea. The cause of whale strandings remains a mystery to scientists, although it's thought that their navigation systems can be disrupted by gently sloping, sandy beaches. There are several theories as to why this happens, including the possibility that they are trying to evade predators such as killer whales, or following a sick leader ashore.... Another theory suggests that human-made undersea nois