Endangered species Birds Rare birds Biological diversity conservation Birds, Protection of Birds, Protector of National parks and reserves Protected areas Biological diversity conservation--Philippine Bird conservation Birds - - Specification 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) Natural resources conservation areas Northern Sierra Madre National Park Rare birds--Philippine Rarebirds Specification Statterfield, Alison J.