Black-and-white diving birds are a type of seabird that can be found in the Northern Hemisphere. Murres (6 letters) and Auks (4 letters) are two species of these birds. Murres are medium-sized birds with black heads, white bellies, and short wings. They are often seen in large flocks near the shoreline. Auks are smaller than Murres and have black backs and white fronts. They are excellent swimmers and divers, and they feed on fish and other small marine animals.