Biological diversity conservation Birds Birds, Protection of Endangered species Biological diversity conservation--Philippine Birds, Protector of Birds, Protectors of Crosby, Michael J. Endangered species--Philippine Forest conservation 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 Rare birds--Philippine Statterfield, Alison J.