iiwi, (species Vestiaria coccinea), Hawaiian songbird, one of the commoner members of the Hawaiian honeycreeper family, Drepanididae, order Passeriformes. A nectar-feeder, named for its squeaky call (“ee-ee-vee”), it is 15 cm (6 inches) long, with a red body, black wings with small white patches, black tail, and sickle-shaped red bill.