`` It 's the largest single-species event '' in the Northeast , a marine mammal expert says . nine of Only 37 dolphins have survived to be released , says International Fund 's Katie Moore . The unexplained beachings of scores of dolphins over the past month along Cape Cod , Massachusetts , is the largest `` single-species event '' of its kind on record in the northeastern United States , a marine mammal specialist said Monday . Necropsies have been done on Only 37 animals ; no cause has been determined . Some of the released animals have been tracked north of United States , where they belong .
`` It 's the largest single-species event '' in the Northeast , a marine mammal expert says . nine of Only 37 dolphins have survived to be released , says International Fund 's Katie Moore . Necropsies have been done on Only 37 animals ; no cause has been determined . Some of the released animals have been tracked north of United States , where they belong .