Using participatory environmental methodologies, the local knowledge system among Sibuyanons in Sibuyan Island, Romblon was examined, revealing a wider understanding on the endemic and threatened faunal species and their habitats outside Mt. Guiting-guiting Natural Park (MGGNP). These and the ecosystem values and services they provide the locals were also known. The 33 endemic and threatened wildlife species have high ecological (predator to pest and pollinator) and economic (source of protein, medicine, pet and trade) values to Sibuyanons. Areas around the Protected Area (PA) provide the Sibuyanons with various ecosystem products and services such as: venue for tourism (39%), source of forest products (33%), shelter for wildlife (11%) and water source (9%). Survey results indicate high occurrence and wide distribution of endemic and threatened faunal species in areas outside the boundaries of MGGNP. Sibuyanons have identified 7,086 occurrence points outside the PA for the 33 endemic and threatened species studied. These plotted observations described areas beyond formerly known habitat ranges of a number of specific fauna studied here, and have not been included in available scientific publications before. Though Sibuyanons have shown high preference (88%) to applying some form of conservation to biodiversified areas outside the PA boundary, the following factors were identified to hinder success in conservation efforts, most of which are anthropogenic in nature: poverty, lack of alternative livelihood opportunities, habitat destruction, insufficient laws and weak environmental ethics. Conservation maps presented in six habitat types were generated using species distribution against community conservation preferences.