Timpoong and Hibok-Hibok comprises about of mossy forests at elevations above , of residual lowland dipterocarp forests at elevations above , and brush lands and open grasslands covering the remaining . The natural monument was established for the conservation of endangered and endemic fauna that live within those forests. They include one bird species and two mammals that can only be found in Camiguin: the Camiguin hanging parrot, and the Camiguin forest mouse and Camiguin forest rat. Other fauna include the Camiguin hawk-owl, writhed hornbill, Mindanao shrew, Camiguin narrow-mouthed frog, big-eyed frog and small rufous horseshoe bat.