The Hawaiian hawk or io (Buteo solitarius) is a raptor of the Buteo genus endemic to Hawaii, currently restricted to the Big Island. Buteos tend to be easily recognized by their bulky bodies relative to their overall length and wingspan. The io is the only hawk that is native to Hawaii, and fossil evidence indicates that it inhabited the island of Hawaii, Molokai, Oahu, and Kauai at one time. Today, it is known to breed only on the Big Island, in stands of native ohia 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.