The "incredibly rare" event was captured by the New England Aquarium aerial survey team.
Researchers say rising global temperatures may be a factor in the sighting.
A rare gray whale, which is usually found in the Pacific Ocean, was spotted 30 miles from Nantucket.
Extinct Gray Whale Viewed Off Nantucket Coast – The Cub
Incredibly rare' gray whale spotted 200 years after extinction from the Atlantic
Incredibly rare' gray whale spotted 200 years after extinction from the Atlantic - ABC News
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Rare gray whale sighting in the Atlantic
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