LOON

Male and female loons have identical plumage. Plumage is largely patterned black-and-white in summer. All have a white belly.

This resembles many sea-ducks but is distinct from most cormorants which rarely have white feathers, and if so usually as large rounded patches rather than delicate patterns. All species of divers have a spear-shaped bill. Males are larger on average, but relative size is only apparent when the male and female are together.