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The site was identified as internationally important for bird conservation in 2001 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Mindanao Bleeding-heart Gallicolumba crinigera	VU	resident (1900–1919)	common	A1, A2
Dark-eared Brown-dove Phapitreron brunneiceps	VU	resident (1937)	present	A1, A2
Chinese Egret Egretta eulophotes	VU	non-breeding (1900–1919)	present	A1
South Philippine Hawk-eagle Nisaetus pinskeri	EN	resident (1900–1919)	present	A1
Mindanao Hornbill Penelopides affinis	LC	resident (1900–1949)	present	A2
South Philippine Dwarf-Kingfisher Ceyx mindanensis	LC	resident (1979)	present	A1
Southern Silvery Kingfisher Ceyx argentatus	NT	resident (1926)	present	A1, A2
Rufous-lored Kingfisher Todiramphus winchelli	VU	resident (1937)	present	A1
Philippine Cockatoo Cacatua haematuropygia	CR	resident (1920–1929)	present	A1
Mindanao Wattled Broadbill Sarcophanops steerii	VU	resident (1937)	present	A1, A2
Celestial Monarch Hypothymis coelestis	VU	resident (1937)	abundant	A1, A2
White-eared Tailorbird Orthotomus cinereiceps	LC	resident (1937)	present	A2
Zamboanga Bulbul Hypsipetes rufigularis	NT	resident (1937)	present	A2
Rusty-crowned Babbler Sterrhoptilus capitalis	LC	resident (1900–1930)	present	A2
Striated Wren-babbler Ptilocichla mindanensis	LC	resident (1900–1930)	present	A2
Little Slaty Flycatcher Ficedula basilanica	VU	resident (1880–1900)	present	A1, A2

Year	Protected Area	Designation (management category)	% coverage of IBA
1939	Basilan	Natural Biotic Area (V)	100

Habitat	% of IBA	Habitat detail
Forest	major (>10)
Artificial/Terrestrial	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Basilan Natural Biotic Area (Philippines). Downloaded from https://datazone.birdlife.org/site/factsheet/basilan-natural-biotic-area-iba-philippines on 23/12/2024.