Mass stranding of dolphins on Cape Cod coastline largest in US history

Almost 150 dolphins were beached during the mass stranding (International Fund for Animal Welfare via AP)

Rescuers who helped free more than a hundred dolphins from the Cape Cod shoreline say they have confirmed that the mass stranding that began on June 28 was the largest involving dolphins in US history.

There were two prior events on record in Hawaii and the Florida Keys where dolphin species were observed circling in shallow water, but the Cape Cod event marks the highest number of dolphins beached in a single stranding event, according to the International Fund for Animal Welfare, which helped lead the rescue.