Habitat associations of fve endemic and threatened Philippine parrot species in two protected areas in the Philippines Keywords: Bataan Natural Park, Busuanga Island, Kingfsher Park, species-habitat association, threatened species Nikki Dyanne C. Realubit Buhay-ilang Research, Education, and Conservation, Inc. Pasig City University of Kansas Kansas, USA Email: dyannerealubit@gmail.com Leticia E. Afuang Institute of Biological Sciences University of the Philippies Los Baños/ Regalo ng Kilit Foundation Inc. Joni T. Acay Buhay-ilang Research, Education, and Conservation, Inc. Carmela E. Española Institute of Biology, College of Science University of the Philippines Diliman Quezon City, 1104 Metro Manila Parrots (Order Psittaciformes) hold the trophy as the most threatened bird group globally. Both direct (e.g., poaching) and indirect threats (e.g., habitat loss and degradation, human population encroachment into their natural range) cause a higher risk of extinction for them than for other bird groups. This study identifes the ecological factors affecting the occurrence (presence of individuals/populations) of fve endemic and threatened parrot species in the Philippines. Variable distance line transect sampling method was employed to determine parrot species occurrence in Bataan Natural Park–Subic Watershed Forest Reserve in Bataan and Kingfsher Park in Busuanga Island, Palawan. Transects were divided into 400-m segments where 22 habitat variables were measured. Canonical correspondence analysis was performed using PAST 2.14. Using DISTANCE 6.0, parrot population density estimates were calculated for fve species: Bolbopsittacus lunulatus (36.6 individuals/ km 2 ), Loriculus philippensis (13.7 individuals/km 2 ), Prioniturus platenae (22.2 individuals/km 2 ), Prioniturus luconensis (1.9 individuals/km 2 ), and Tanygnathus lucionensis (0.6 individuals/km 2 ). The key fndings of the parrot-habitat association suggest that parrot species are primarily infuenced by tree structure and slope. The presence of fruit trees, palms, epiphytes, crops, and pioneering plants is also positively associated with parrot species abundance. Sylvatrop, The Technical Journal of Philippine Ecosystems and Natural Resources 32 (1): 77–100