200-year extinct Atlantic gray whale spotted off Nantucket due to ice-free Northwest Passage.

A gray whale, considered extinct in the Atlantic Ocean for over 200 years, has been spotted off the coast of Nantucket by researchers at the New England Aquarium. The whale's presence is likely due to climate change, as the Northwest Passage, which connects the Atlantic and Pacific through the Arctic Ocean, has been ice-free in recent summers, allowing gray whales to potentially travel the passage during the summer season.