The New England Aquarium is shifting its mammal rescue efforts to the National Oceanic and Atmospheric Administration. It will no longer be the lead response agency for seal, dolphin and whale strandings Martha’s Vineyard, Nantucket and the north shore of Massachusetts.

With the help of two ferries and some human rescuers, a cold-stunned sea turtle made its way from a Chappaquiddick beach to the New England Aquarium Monday.

A 13-foot pilot whale washed up on Lucy Vincent Beach in Chilmark over the long weekend. Adam Kennedy, a senior biologist at the New England Aquarium, said the whale was likely dead when it washed ashore.

Mr. Kennedy said the animal was discovered half-buried in the sand by the tides last Friday. Only its head and front fin were visible; the rest of its body was obscured. The conditions were “very unusual,” Mr. Kennedy said.

An Atlantic common dolphin washed up on Lucy Vincent Beach Monday. Tony LaCasse, spokesman for the New England Aquarium, said the recently-deceased mammal showed no signs of external injuries. He estimated the dolphin measured 7 feet, 4 inches and weighed 250 pounds. The local marine mammal stranding team and New England Aquarium were notified of the incident. Following the advice of an expert, the animal was buried on the beach. The dolphin was not among a group recently stranded off the outer Cape and later released, Mr. LaCasse said.

Last Wednesday evening Kathy Cerick and her family were walking on Lobsterville Beach near Dogfish Bar when they spotted a seal. It did not move when they approached it, so they took photographs and called the police who called the New England Aquarium. Ms. Cerick later received a call from the Aquarium asking her to forward the photographs. The Aquarium then responded that the seal was a harp seal. Ms. Cerick was asked to check on the seal again the next day, which she did, but the seal was gone.