Little-known beaked whale found in cold waters off Hokkaido

Cetaceans are the best-known fully aquatic animals, including whales, dolphins and porpoises. The group includes more than 90 existing species, divided into baleen whales (Mysticeti) and toothed whales (Odontoceti). Toothed whales are so named because all species in this family possess teeth. Among them, the distribution and ecology of genus Mesoplodon are little known, because they typically live offshore in the ocean and rarely surface.