WELLFLEET, Mass. (AP) _ A flurry of dolphin strandings that took the lives of 44 of the sea mammals has ended as mysteriously as it began.

Experts from the New England Aquarium and volunteers from the Cape Cod Stranding Network kept watch, but said there were no new strandings Sunday.

``There's no more reports of anything. They're just sort of keeping a watch out,'' said aquarium spokeswoman Susan Knapp.

From late Thursday evening to sundown Saturday, a total of 47 white-sided dolphins were stranded, Knapp said. Of those, 20 died, 24 were euthanized and three were tagged and released back into the ocean.

Such strandings are not uncommon on Cape Cod, but their causes remain a mystery. Once beached, the deep-water animals do not usually survive.

One theory is that the new moon, coupled with unusually high tides, could have contributed to the behavior. Another theory suggests that the dolphins become confused by the Cape's unusual geography and cannot find their way back to the open ocean.

Last year, 97 dolphins died between late January and late February when they became stranded on the Cape. Whales also have been known to beach themselves on the area's shores.

The Atlantic white-sided dolphins are found between southern Greenland and northern Virginia and are known to travel in groups of nearly 1,000. The dolphins range in size from about 6 feet to 9 feet and weigh up to 400 pounds, aquarium officials said.

Animal autopsies were being performed to try to pinpoint the exact cause of death of the most recent strandings _ and to learn more about the species, Knapp said.

On Saturday, groups of volunteers stroked and held the animals while the veterinarians administered injections to euthanize them.

Sunday's tasks were just as grim, Knapp said, as the dead animals were studied at a facility at the Audubon Society in Wellfleet and arrangements were made to dispose of them.