GREY WHALE NOT SEEN IN ATLANTIC FOR 200 YEARS DOCUMENTED SWIMMING PAST NANTUCKET : CLIMATE CHANGE

DAILY MAIL UK : EXTINCT FROM ATLANTIC FOR 200 YEARS : GREY WHALE : CLIMATE CHANGE 

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'The Northwest Passage, which connects the Atlantic and Pacific through the Arctic Ocean in Canada, has regularly been ice-free in the summertime in recent years, partly due to rising global temperatures,' the aquarium said.

This means that more gray whales could potentially travel the Northwest Passage during the summer when normally they would have been blocked.

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O'Brien, an associate research scientist with the Anderson Cabot Center for Ocean Life at the New England Aquarium, said the animal's arrival off New England serves 'as a reminder of how quickly marine species respond to climate change, given the chance.'

So how can you tell a gray whale apart from its counterparts?

Unlike the humpback whale, which is more commonly sighted in New England, gray whales can be identified by their lack of a dorsal fin and mottled appearance. 

They also sound different; gray whales make gurgles, grunts and croaks while humpback wales produce what is known as 'songs' as it is reminiscent of human vocals.