Cormorants range in size from as little as 45 cm (18 in) and 340 g (12 oz) to a maximum size 100 cm (40 in) and 5 kg (11 lbs). Most cormorants, including nearly all northern hemisphere species, have mainly dark feathers. Some southern hemisphere species are black and white. A few species are very colorful. Many species have areas of colored skin on the face. These areas can be bright blue, orange, red or yellow. They usually become more brightly colored in the breeding season. The bill is long, thin, and sharply hooked. Their feet have webbing between all four toes.