Another dolphin stranded on Cape Cod

Massachusetts wildlife officials say they have no idea why so many dolphins and whales have been stranded this winter on Cape Cod.

In the seventh mass stranding on Cape Cod Friday, 13 dolphins beached themselves in Wellfleet. Dozens of volunteers tried to rescue the animals, but eight of the dolphins were dead, or were euthanized, the Boston Globe reported Saturday.

So far this winter, mass stranding incidents at Cape Cod Bay have involved 72 dolphins and 18 pilot whales swept to shore and unable to return to the water independently.

It`s believed the mammals come into the bay looking for food and get disoriented by the tides, said Tony LaCasse, spokesman for the New England Aquarium.