A record 129 dolphins have stranded in Cape Cod over the past 3 weeks. (CNN)

(CNN) — 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.

A total of 129 common dolphins have been found since the animals began stranding themselves in early January, said Katie Moore, marine mammal rescue and research manager for the International Fund for Animal Welfare.

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