The Coot is 36-42 cm long, and is largely black except for the white facial shield (which gave rise to the phrase "as bald as a coot"). As a swimming species, the Coot has partial webbing on its long strong toes.The juvenile is paler than the adult, has a whitish breast, and lacks the facial shield; the adult black plumage develops when about 3-4 months old, but the white shield is only fully developed at about one year old, some time later.This is a noisy bird with a wide repertoire of crackling, explosive or trumpeting calls, often given at night.