Plump, short-tailed bird found only on Cocos Island, located in the Pacific Ocean about 300 miles southwest of mainland Costa Rica. Sexes look quite different. Adult male is almost all black with a dark bill. Female and young male are buffy brown and streaked all over; bill may be black or yellowish, and often have cinnamon wingbars. It is the most common bird on the island, and found in nearly every habitat.