A large black seabird that holds its wings in a distinctive crook. The long, forked tail may appear pointed when folded. Males are all black with a red throat pouch. Females have a white breast. Immatures have a white head and breast. Nests in the northwestern Hawaiian Islands, but large numbers roost on some of the small islets near the main islands. Often seen flying along the shoreline, sometimes very high, and sometimes inland. Chases other seabirds to steal their prey.