The park is generally rolling to mountainous with a dominant slope ranging from 18 per cent to 50 per cent, with an elevation ranging from 297 to 1,763 metres above sea level.
Unique Flora
vascular plants belonging to the families Cyperaceae, Araceae, Rubiaceae, Dipterocarpaceae, Burseraceae, Myrtaceae, Araucariaceae, ferns, stranglers, epiphytes, and lianas or the woody vines.
A total of 325 fern species in 29 families, and 28 species of lycophytes in 2 families are present in the park.
Out of 29 families of ferns, Hymenophyllaceae dominates the area, followed by Thelypteridaceae, Dryopteridaceae, Pteridaceae, Polypodiaceae, Aspleniaceae, Athyriaceae, and Lindsaeaceae.
For the lycophytes species, Sellaginellaceae dominates the park.
A total of 237 tree species are present in the area, belonging to the Dipterocarpaceae, Euphorbiaceae, Meliaceae, Moraceae, and Lauraceae.
Unique Fauna
Endangered Negros shrew (Crocidura negrina), Critically Endangered Philippine Tube-nosed fruit bat (Nyctimene rabori) and the Visayan warty pig (Sus cebifrons negrinus), the Endangered Visayan spotted deer (Rusa alfredi), and the Visayan leopard cat (Prionailurus bengalensis rabori);
Philippine endemic species such as the Endangered Golden-crowned flying fox (Acerodon jubatus), Vulnerable species Fischer’s pygmy fruit bat (Haplonycteris fischeri), Harpy fruit bat (Harpionycteris whiteheadi), and the Golden-mantled flying fox Pteropus pumilus
A total of 209 resident and migrant birds are recorded, 14 species of these are globally threatened, most notably the Critically Endangered Negros bleeding-heart pigeon (Gallicolumba keayi) and the Visayan wrinkled-billed hornbill (Aceros waldeni) along with several Endangered species of birds such as the Negros-striped babbler (Stachyris nigrorum), Flame-templed babbler Dasycrotapha speciosa, Japanese night-heron (Gorsachius goisagi), and White-throated jungle flycatcher Rhinomyias albigularis.
The entire Balinsasayao Twin Lakes Natural Park is within the Cuernos de Negros, an Important Bird Area as referred to by Mallari et al., 2001. Different recreational activities are recommended, as long as the activities would not disturb or affect the integrity of the area including its wildlife and environs.
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