More than 100 dolphins stranded in shallow water around Cape Cod

Volunteers work to herd Atlantic white-sided dolphins found Friday in Wellfleet, Massachusetts, into deeper water

More than 100 dolphins have become stranded in the shallow waters around Cape Cod on Friday in what an animal welfare group is calling the largest single mass stranding event" in the organization's 25-year history.

A group of Atlantic white-sided dolphins were found Friday in Wellfleet, Massachusetts, about 100 miles south-east of Boston, in an area called the Gut - or Great Island at the Herring River - which experts have said is the site of frequent strandings, due in part to its hook-like shape and extreme tidal fluctuations.