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Location Philippines, Region IX
Central coordinates 122o 3.00' East  6o 35.00' North
IBA criteria A1, A2
Area 4,363 ha
Altitude 0 - 968m
Year of IBA assessment 2001

Haribon Foundation

Site description Basilan Island lies c.20 km south of the tip of the Zamboanga Peninsula of south-western Mindanao. It is a hilly island, with several peaks that ascend to almost 1,000 m, including Mt Kebang (Twin Peak) and Mt Mohadji. This IBA includes the forests that remain in the hilly central part of the island, which are recommended by the DENR-9 for protection under the NIPAS as the Basilan Natural Biotic Area. An area of 234 ha of primary forest is reported to remain on Mt Mohadji, which also has patches of secondary forest which cover a total area of 2,500 ha. These areas were logged more than 20 years ago, but have now regenerated. Most of this is lowland forest, with limited areas of mossy forest around the highest peaks.

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 
Chinese Egret Egretta eulophotes non-breeding  2001  present  A1  Vulnerable 
Nisaetus philippensis resident  2001  present  A1  Not Recognised 
Mindanao Bleeding-heart Gallicolumba crinigera resident  2001  present  A1  Vulnerable 
Dark-eared Brown-dove Phapitreron brunneiceps resident  2001  present  A1  Vulnerable 
Alcedo argentata resident  2001  present  A1  Not Recognised 
Ceyx melanurus resident  2001  present  A1  Not Recognised 
Rufous-lored Kingfisher Todiramphus winchelli resident  2001  present  A1  Vulnerable 
Mindanao Broadbill Eurylaimus 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 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Basilan Natural Biotic Area 4,490 protected area contains site 4,363  
Basilan Buffer Zone Natural Biotic Area - Buffer Zone 2,037 protected area is adjacent to site 0  


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

Protection status This IBA includes part of Basilan National Park, which was declared by Proclamation No. 457 on 25 September 1939 and amended by Proclamation No. 1531 on 2 February 1976. Basilan Natural Biotic Area is recommended for protection by the DENR-9 under the NIPAS.

Related state of the world's birds case studies

References Davis et al. (1995).

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Basilan Natural Biotic Area. Downloaded from on 02/09/2014

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