Map of Mindanao Island in relation to the remaining Philippine archipelago (inset). Numbered study sites correspond to those listed in Table 1. Colored contours correspond to elevation (elevation key). Dinagat Island (Site 13) is often presumed to possess the same herpetofauna as Siargao (the small island to its southeast), whereas the fauna of Camiguin Sur Island (Sites 9–12) has been assumed to be somewhat distinct from that of Mindanao. Neither of these generalizations has been examine critically (Brown and Alcala 1967, 1970; Ross and Lazell 1991; Nuñeza and Galorio 2015). Province names are abbreviated with unique letter combinations used in text and tables (provincial map key), and numbered sites are assigned to province (surveyed sites key) for clarity.