Birds Endangered species Rare birds Biological diversity conservation Birds, Protection of Biological diversity conservation--Philippine Bird conservation Birds - - Specification Birds, Protector of Birds, Protectors of Crosby, Michael J. Endangered species--Philippine Forest conservation Forest protection Lake Lanao Mallari, Neil Aldrin D. Mount Kitanglad (Bukidnon) Mount Piagayungan (Lanao del Sur) National parks and reserves Natural resources conservation areas Northern Sierra Madre National Park Protected areas Rare birds--Philippine Rarebirds Statterfield, Alison J.