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The site was identified as important 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 List1	Season	Year(s)	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

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2001) may differ.

Year	Protected Area	Designation	% overlap with IBA
-	Basilan Buffer Zone	Natural Biotic Area - Buffer Zone	9
1939	Basilan	Natural Biotic Area	100

Habitat1	Habitat detail	% of IBA
Forest		major (>10)
Artificial/Terrestrial		-

1. IUCN Habitat classification.

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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 22/11/2024.