A large pigeon with a mostly gray body, green wings, and a distinctive and diagnostic black fleshy knob above the bill. Found mostly in inland forest up to around 1000 meters of elevation. Juvenile resembles Island Imperial-Pigeon, but is smaller and overall darker, especially on the wings. Adult is separated from Island Imperial-Pigeon by its black bill knob. Often heard giving an extended, rapidly bubbling “crrrroooooo” call.