Adult Pigeon Guillemot have black bodies with a white wing patch broken by a black wedge, a thin dark bill and red legs and feet. They are similar in appearance to the Black Guillemot but show dark wing linings in flight. Unlike many alcids, Pigeon Guillemots are diurnal and lay two eggs. Because they can feed their chicks constantly throughout the day, the chicks fledge faster than equivalent sized auks that are only provisioned at night.