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More than 100 Atlantic white-sided dolphins stranded in muddy location off Cape Cod, Massachusetts

Jun 28, 2024, 7:52 PM

Over 100 Atlantic white-sided dolphins were stranded in a muddy location off Cape Cod, Massachusett...

Over 100 Atlantic white-sided dolphins were stranded in a muddy location off Cape Cod, Massachusetts, on June 28. (International Fund for Animal Welfare via CNN Newsource)

(International Fund for Animal Welfare via CNN Newsource)

(CNN) — More than 100 dolphins were stranded off Cape Cod, Massachusetts, on Friday, in what the International Fund for Animal Welfare described as possibly “the largest single mass stranding event” in the organization’s 25-year history.

The dolphins were found Friday in Wellfleet in an area called the “Gut” or Great Island at the Herring River, which Stacey Hedman, the fund’s communications director, described as a “very difficult location with dangerous mud.”

The town of Wellfleet is a little over 100 miles southeast of Boston.

The non-profit, which rescues, rehabilitates and releases animals, described the Herring River Gut as “the epicenter of our mass strandings” in a Facebook post.

“We had 125 Atlantic white-sided dolphins strand and 10 died before we arrived,” Hedman said in an email to CNN on Friday.

“The plan, given the number, is to triage and aim to support animals, refloat and herd as many as possible,” Hedman said. “Luckily, it is cooler today, but these animals will risk sunburn and overheating until the tide rises, and then we have the challenge of herding them into deeper water.”

The rescue operation, in which at least 25 fund workers and 100 volunteers assisted, was ongoing by early Friday evening an hour after high tide, according to Hedman.

The Whale and Dolphin Conservation, the Center for Coastal Studies, AmeriCorps of Cape Cod and the New England Aquarium are also supporting the operation.

“We estimate 115 live dolphins, and we’re continuing to encourage them further out of the shallow mud flats,” Hedman told CNN Friday evening. “The tide in this area can be 10-11 feet, and can make a dramatic difference in just a few hours.”

During the earlier low tide shortly before 11:30 a.m., the marine mammal rescue team, while on foot, attempted to herd the dolphins out of the estuary and into the deeper waters offshore, according to the fund.

The high tide just before 5 p.m. worked in rescuers’ favor as they used the rising tide to refloat the animals, Hedman said.

There are three small vessels in the water “to continue herding and using underwater pingers (noise) to urge the dolphins in the right direction,” according to Hedman.

She noted there is no set explanation for why dolphins strand.

“Cape Cod is a global stranding hotspot due to the curvature of our shores and the fluctuation of our tides,” Hedman said.

More dolphins get stranded along Cape Cod’s 12-mile stretch of shoreline than any other place globally, according to the fund.


CNN’s Ashley R. Williams contributed to this report.

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More than 100 Atlantic white-sided dolphins stranded in muddy location off Cape Cod, Massachusetts