SEE IT: MYSTERY SURFER CAUGHT ON VIDEO SAVING BIRD DROWNING IN THE WAVES: ‘A HERO’ Gotham Whale, an organization that tracks marine life in the New York City area, told Fox News Digital that the sighting was "somewhat [of an] unusual event."

People on the Brooklyn shore got a glimpse of the whale flashing its tail out of the water, according to the U.S. Coast Guard, which received multiple reports from spectators

Video shows a whale swimming under the Brooklyn Bridge on Monday, surprising onlookers. The sighting came after a mother and calf whale were seen near Spring Lake, NJ. (Credit: Helena Lippolis)