Scientists baffled by U.S. stranding of dolphins

Scientists are struggling to explain the stranding of 31 dolphins and a pilot whale off the coast of Massachusetts since the start of the year, including some found with brain deformities or chronic diseases.

Eight Atlantic White-sided dolphins were found on Tuesday, following 23 dolphins, a pilot whale and a seal discovered since January 1 in the hook-shaped Cape Cod region and its maze of sandbars and marshes that are a magnet for tourists in summer.

The number is unusually high, according to the Cape Cod Stranding Network that oversees rescue efforts. It typically averages 200 rescues a year, compared to 31 rescues performed in the last 10 days alone.

At least 14 of the dolphins have died, including two which were euthanized, the network said. The strandings involved Atlantic White-sided dolphins and so-called common dolphins, neither of which are endangered.