The Hawaiian hawk or ʻio (Buteo solitarius) is a raptor of the Buteo genus endemic to Hawaiʻi, currently restricted to the Big Island. Buteos tend to be easily recognized by their bulky bodies relative to their overall length and wingspan. The ʻio is the only hawk that is native to Hawaiʻi, and fossil evidence indicates that it inhabited the island of Hawaiʻi, Molokaʻi, Oʻahu, and Kauaʻi at one time. Today, it is known to breed only on the Big Island, in stands of native ʻōhiʻa lehua (Metrosideros polymorpha) trees. The species is protected as an endangered species in the United States. However, the IUCN classifies the species as Near Threatened.