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The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):

Species	Current IUCN Red List Category	Season	Year(s)	Population estimate at site	IBA criteria met
Bornean Partridge Arborophila hyperythra	LC	resident	2004	present	A2, A3
Crimson-headed Partridge Haematortyx sanguiniceps	LC	resident	2004	present	A2, A3
Ferruginous Partridge Caloperdix oculeus	NT	resident	2004	present	A3
Bulwer's Pheasant Lophura bulweri	VU	resident	1993-1999	present	A1, A3
Dulit Frogmouth Batrachostomus harterti	NT	resident	2004	present	A2, A3
Gould's Frogmouth Batrachostomus stellatus	NT	resident	2004	present	A3
Bornean Ground-cuckoo Carpococcyx radiceus	VU	resident	2004	present	A3
Whitehead's Trogon Harpactes whiteheadi	NT	resident	2004	present	A2, A3
Rhinoceros Hornbill Buceros rhinoceros	VU	resident	2004	present	A3
Bornean Barbet Psilopogon eximius	LC	resident	2004	present	A2, A3
Golden-naped Barbet Psilopogon pulcherrimus	LC	resident	2004	present	A2, A3
Mountain Barbet Psilopogon monticola	LC	resident	2004	present	A2, A3
Blue-banded Pitta Erythropitta arquata	LC	resident	2004	present	A3
Hose's Broadbill Calyptomena hosii	NT	resident	2004	present	A2, A3
Whitehead's Broadbill Calyptomena whiteheadi	LC	resident	2004	present	A2, A3
Black Oriole Oriolus hosii	NT	resident	2004	present	A2, A3
Black-and-crimson Oriole Oriolus consanguineus	LC	resident	2004	present	A3
Bornean Whistler Pachycephala hypoxantha	LC	resident	2004	present	A2, A3
Sunda Cuckooshrike Coracina larvata	LC	resident	2004	present	A3
Bornean Treepie Dendrocitta cinerascens	LC	resident	2004	present	A3
Chestnut-vented Bulbul Alophoixus ruficrissus	LC	resident	2004	present	A3
Bornean Stubtail Urosphena whiteheadi	LC	resident	2004	present	A2, A3
Chestnut-crested Yuhina Staphida everetti	LC	resident	2004	present	A2, A3
Pygmy White-eye Heleia squamifrons	LC	resident	2004	present	A2, A3
Mountain Black-eye Zosterops emiliae	LC	resident	2004	present	A2, A3
Black Babbler Melanocichla lugubris	LC	resident	2004	present	A3
Mountain Wren-babbler Gypsophila crassa	LC	resident	2004	present	A2, A3
Sunda Laughingthrush Garrulax palliatus	NT	resident	2004	present	A2, A3
Chestnut-hooded Laughingthrush Pterorhinus treacheri	LC	resident	2004	present	A3
Everett's Thrush Zoothera everetti	NT	resident	2004	present	A2, A3
Black-sided Flowerpecker Dicaeum monticolum	LC	resident	2004	present	A2, A3
Whitehead's Spiderhunter Arachnothera juliae	LC	resident	2004	present	A2, A3
Temminck's Sunbird Aethopyga temminckii	LC	resident	2004	present	A3

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2004).

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Forest		-

For more information about the IUCN Habitat classification, please click here.

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Usun Apau plateau. Downloaded from http://datazone.birdlife.org/site/factsheet/usun-apau-plateau-iba-malaysia on 04/12/2023.