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DENNIS, UNITED STATES: Rescue workers from the New England Aquarium inspect several dead pilot whales that washed up on a Dennis, Massachusetts beach 29 July, 2002 where another 46 whales were saved and pushed back out to sea at high tide. Teri Frady, spokesperson for the local field office of the National Marine Fisheries Service, said it was the largest mass stranding of whales since the mid-1980s. Scientists are divided as to why the beachings occur, with some citing particular weather conditions and others the outcome of the whales chasing food in shallow waters. AFP PHOTO/John MOTTERN (Photo credit should read JOHN MOTTERN/AFP/Getty Images)

DENNIS, UNITED STATES:  Rescue workers from the New England Aquarium inspect several dead pilot whales that washed up on a Dennis, Massachusetts beach 29 July, 2002 where another 46 whales were saved and pushed back out to sea at high tide. Teri Frady, spokesperson for the local field office of the National Marine Fisheries Service, said it was the largest mass stranding of whales since the mid-1980s. Scientists are divided as to why the beachings occur, with some citing particular weather conditions and others the outcome of the whales chasing food in shallow waters.  AFP PHOTO/John MOTTERN (Photo credit should read JOHN MOTTERN/AFP/Getty Images)