The probably extinct Po-o’uli, or black-faced honeycreeper, wasn’t discovered until 1973 by students from the University of Hawaii, who found the bird on the northeastern slopes of Haleakala. It was the first species of Hawaiian honeycreeper to be discovered since 1923. The name po-o’uli means “dark head,” referring to the bird’s characteristic feature, a black “bandit” mask. This bird’s dramatic population decline has been attributed to habitat loss; mosquito-borne diseases; predation by pigs, rats, cats, and mongooses; and a decline in the native tree snails that the Po-o’uli relies on for food.