A look at the bump-like knobs known as tubercles on the top of the head of a Humpback whale (Megaptera novaeangliae). Each protuberance contains at least one stiff hair. The purpose of these hairs is not known, though they may provide the whale with a sense of 'touch', Hawaii, United States of America

adult animal animal behaviour baleen whale blue blue background breaching cetacea chordata close up color image day endangered animals hawaii hawaiian islands head horizontal humpback whale mammal marine life megaptera megaptera novaeangliae no people novaeangliae one animal pacific ocean protuberance sea life side view splashing surface surfacing tropical climate tubercle water whale adult animals animal animal behavior animal behaviors animal behaviours animal theme animal themes animals animals in the wild baleen baleen whales close up color colour daytime endangered endangered animal hawaiian humpback humpback whales mammalia mammals no one nobody pacific splash splashes surfacing behaviour tropical tropics vertebrata whales wild wildlife tubercles