At least 81 dolphins found dead or died shortly after the discovery of Cape Cod in a series of largely unaccountable to the coast began early last month, according to the National Oceanic and Atmospheric Administration.
More than 100 dolphins, which are considered common and white-sided, were found stranded along the rocky coast of Massachusetts since January, said NOAA spokeswoman Teri Rowles and activists engaged in relief work.
Sometimes in groups of mammals, 10, said Katie Moore, a director of the International Fund for Animal Welfare.
Activists say they transport dolphins that live in trailers after they are marked on one side of outer Cape Cod, which is released.
While dolphins are common to the coast of Cape Cod, program director of welfare group called the latest version of the dead dolphins are "disturbing".
"Cape Cod beach, observing an average of 120 dolphins per year," said AJ Cady.
It is not clear what caused the mass death, but recent changes in water temperature can also be a contributing factor to the confused mammals, says Michael Flanagan, Wellfleet harbor.
When the country they are vulnerable to predators, and is prone to sunburn and damage to organs.
"Normally during the winter port of ICES, and prevent animals approaching the coast," says Flanagan. "But now, when the water is warmer, we see more dolphin food than ever before."
But the coast, and causes of death are not clear, Rowles said, adding that the region has not experienced such a phenomenon is more than a decade.
In a similar episode last year, dozens of dead seals found along the coast of Maine and Massachusetts.
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