According to Youri van den Hurk, the gray whale is the only species that has completely disappeared from the entire Atlantic ocean. Therefore, the 1st of March, 2024 will definitely be marked as a very special day in history. New England Aquarium scientists were flying 30 miles south of Nantucket when they sighted a gray whale off the New England coast: a species that was thought to have been extinct in the Atlantic for more than 200 years.
More info: New England Aquarium