A monograph of the Bucerotid, or family of the hornbills..[London]Published for the subscribers by the author [printed by Taylor and Francis]1882..biodiversitylibrary.org/page/38534569
Alae ula or Hawaiian moorhenSubspecies is endemic to the Hawaiian islandsFederally listed as an endangered species"Domesticated" (Waimea Valley, Oahu)nativeplants.hawaii.edu