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Location Philippines, Region XIII
Central coordinates 125o 43.00' East  9o 6.00' North
IBA criteria A1, A2
Area 16,225 ha
Altitude 200 - 1,837m
Year of IBA assessment 2001

Haribon Foundation



Site description Mt Hilong hilong lies on the boundaries of Agusan del Norte, Agusan del Sur and Surigao del Sur Provinces, in the northern portion of the Diwata range of north-east Mindanao. It is the highest mountain in the range, but several of the other peaks included in the IBA also reach well over 1,000 m. The IBA comprises a large block of forest that is shown on recent forest cover maps. Much of this forest is montane, but there are also likely to be some substantial areas of lowland forest. The Cabadbaran-Santiago Natural Park is located on flat to rolling land from 200-1,700 m. It includes c. 3,002 ha (58%) of residual forest, including a 120 ha rattan plantation established by the DENR, c. 1,682 ha (33%) of brushland with medium-sized trees and c.318 ha (6%) of grassland. Cultivated land covers c.163 ha (3%), and is planted with corn, root crops and fast-growing exotic tree species, such as yemane or gmelina Gmelina arborea. Cabadbaran-Santiago Natural Park was declared as a forest watershed reservation because it is the main source of water for the municipalities of Cabadbaran and Santiago. A 500 ha area has been set aside as ancestral domain.

Key Biodiversity Many of the threatened and restricted-range species of the Mindanao and Eastern Visayas Endemic Bird Area have been recorded on Mt Hilong-hilong, most during collecting expeditions in the 1950s and 1960s. These birds include both lowland and montane forest specialists, and, given the relatively large areas of low altitude forest that are reported to remain in this IBA, it could prove to be one of the most important sites for lowland forest birds in the EBA. Some of these birds obviously occur at high densities there, notably Wattled Broadbill. Three of the restricted-range birds have subspecies that are only known from Mt Hilong-hilong (although they presumably occur elsewhere in the Diwata range), Grey-hooded Sunbird A. p. diuatae, Olive-capped Flowerpecker D. n. diuatae and Black-masked White-eye L. g. gracilis. The Pangulangan Caves harbor large populations of cave bats and swiftlets.

Non-bird biodiversity: The Pangulangan Caves harbour large populations of cave bats and swiftlets.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Philippine Cockatoo Cacatua haematuropygia resident  2001  present  A1  Critically Endangered 
Japanese Night-heron Gorsachius goisagi winter  2001  present  A1  Endangered 
Philippine Eagle Pithecophaga jefferyi resident  2001  present  A1  Critically Endangered 
Mindanao Bleeding-heart Gallicolumba crinigera resident  2001  present  A1  Vulnerable 
Dark-eared Brown-dove Phapitreron brunneiceps resident  2001  present  A1  Vulnerable 
Giant Scops-owl Otus gurneyi resident  2001  present  A1  Vulnerable 
Philippine Eagle-owl Bubo philippensis resident  2001  present  A1  Vulnerable 
Alcedo argentata resident  2001  present  A1  Not Recognised 
Ceyx melanurus resident  2001  present  A1  Not Recognised 
Blue-capped Kingfisher Actenoides hombroni resident  2001  present  A1  Vulnerable 
Mindanao Broadbill Eurylaimus steerii resident  2001  present  A1  Vulnerable 
Azure-breasted Pitta Pitta steerii resident  2001  present  A1  Vulnerable 
Celestial Monarch Hypothymis coelestis resident  2001  present  A1  Vulnerable 
Little Slaty Flycatcher Ficedula basilanica resident  2001  present  A1  Vulnerable 
Philippine Leafbird Chloropsis flavipennis resident  2001  present  A1  Vulnerable 

IBA Monitoring

2013 very high not assessed low
unset
Unknown

Agricultural expansion and intensification annual & perennial non-timber crops - shifting agriculture happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Energy production and mining mining and quarrying happening now small area/few individuals (<10%) slow but significant deterioration low
Human intrusions and disturbance work and other activities happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Over-exploitation, persecution and control of species logging & wood harvesting - unintentional effects: subsistence/small scale happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Transportation and service corridors roads and railroads happening now some of area/population (10-49%) slow but significant deterioration medium

Most of site (50-90%) covered (including the most critical parts for important bird species)  A management plan exists but it is out of date or not comprehensive  Some limited conservation initiatives are in place  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Andanan River Watershed Forest Reserve 17,888 protected area overlaps with site 0  
Cabadbaran Watershed Forest Reserve 15,977 protected area overlaps with site 0  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Artificial - terrestrial   -
Forest   -

Protection status The proposed Cabadbaran-Santiago Natural Park lies within the Mt Hilong-hilong IBA. The area was declared as a forest watershed reservation by Presidential Proclamation No. 834, series of 1991.

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Mount Hilong-hilong. Downloaded from http://www.birdlife.org on 29/11/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife