Keywords: tail, Humpback whale, megaptera novaeangliae, baleen whale, rorqual, near Gloucester, Massachusetts, Atlantic Ocean, whale watch tour, mammal, sea, ocean, New England, USA, United States of America, North America, nature, marine mammal, photography, outdoors, animal, wildlife, water, dive, diving, two whales, two whale tails, whale tails, cow and calf humpback whales