The `Apapane (Himatione sanguinea) and Hawai`i `Amakihi (Hemignathus virens) are the most abundant native birds in the IBA and also occur on other islands, but still have globally restricted ranges. The Mauna Loa-Kilauea area also supports important populations of three other endemic Hawaiian forest birds of global conservation concern, the `I`iwi (Vestiaria coccinea), Oma`o (Myadestes obscurus), and Hawaii `Elepaio (Chasiempis s. The `Io is widespread and is seen frequently over much of the area. The `Akiapola`au, Hawai`i Creeper, and `Akepa are sparsely-distributed and occur only in native forest above 5,000 feet (1,500 meters). Endangered Species Act, the `Akiapola`au (Hemignathus munroi), Hawai`i Creeper (Oreomystis mana), Hawai`i `Akepa (Loxops coccineus), and `Io or Hawaiian Hawk (Buteo solitarius). The Mauna Loa-Kilauea Forests Important Bird Area supports one of the most important remaining concentrations of endemic Hawaiian birds, including populations of four species that are endemic to Hawaii Island and are listed under the U.S. The Kau Forests IBA, which occupies the southwestern flank of Mauna Loa, is separated by intervening areas of barren lava and open grassland cleared for cattle ranching and sugar cane cultivation. The Mauna Kea Wet Forests IBA is a short distance to the north. The northern edge follows the boundary between lava flows from Mauna Loa and Mauna Kea, which often coincides with the Saddle Road. The western boundary of the IBA follows the 7,000-foot (2,130-meter) contour, because land above this is mostly barren lava. Native plants dominate many areas, but alien plants are widespread, particularly at lower elevations. Dense rainforest covers most of the eastern portion, grading into mesic woodland, shrubland, and grassland in leeward areas to the west. Moisture-laden northeasterly tradewinds cause rainfall to be higher on the eastern slopes, peaking at over 150 inches (4 meters) per year around 2,000 feet (600 meters) elevation.

Areas of older lava are densely vegetated, but lands downslope from active volcanic vents are barren and covered by recent lava flows.

The terrain consists of gentle to moderate slopes, punctuated in some areas by volcanic craters and vents. Land parcels within the IBA include all or part of Hawai`i Volcanoes National Park, Pu`u Maka`ala, Kahaualea, and Waiakea 1942 Lava Flow State Natural Area Reserves, Kipuka Ainahou State Nene Sanctuary, Upper Waiakea Bog Sanctuary, Mauna Loa, Ola`a, Waiakea, Upper Waiakea, and Wao Kele O Puna State Forest Reserves, Kulani State Correctional Facility, and Keauhou Ranch and other private lands owned by Kamehameha Schools. The IBA includes about 109,068 hectares extending from 500 to 7,000 feet (150 to 2,130 meters) elevation. Both these volcanoes are active, and Kilauea has been erupting continuously since 1983. The Mauna Loa-Kilauea Forests Important Bird Area is located on the island of Hawaii and encompasses the eastern flank of Mauna Loa Volcano and lands surrounding Kilauea Volcano.

Hawaii mauno loa