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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') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Maleo Macrocephalon maleo	CR	resident	2004	present	A1, A2
White-bellied Imperial-pigeon Ducula forsteni	LC	resident	2000	present	A2
White Imperial-pigeon Ducula luctuosa	LC	resident	2000	present	A2
Maroon-chinned Fruit-dove Ramphiculus epius	LC	resident	2000	present	A2
Heinrich's Nightjar Eurostopodus diabolicus	LC	resident	2004	present	A1, A2
Isabelline Bush-hen Amaurornis isabellina	LC	resident	2000	present	A2
Japanese Night Heron Gorsachius goisagi	VU	winter	2004	present	A1
Minahasa Masked-owl Tyto inexspectata	LC	resident	2004	present	A1, A2
Ochre-bellied Boobook Ninox ochracea	NT	resident	2000	present	A2
Dwarf Sparrowhawk Accipiter nanus	LC	resident	2000	present	A2
Purple-bearded Bee-eater Meropogon forsteni	LC	resident	2000	present	A2
Sulawesi Dwarf-kingfisher Ceyx fallax	LC	resident	2000	present	A2
Actenoides princeps	NR	resident	2000	present	A2
Blue-headed Kingfisher Actenoides monachus	NT	resident	2000	present	A2
Sulawesi Lilac Kingfisher Cittura cyanotis	LC	resident	2000	present	A2
Pygmy Hanging-parrot Loriculus exilis	LC	resident	2000	present	A2
Yellowish-breasted Racquet-tail Prioniturus flavicans	NT	resident	2000	present	A2
Sulphur-bellied Whistler Pachycephala sulfuriventer	LC	resident	2000	present	A2
Pied Cuckooshrike Coracina bicolor	NT	resident	2000	present	A2
Sulawesi Drongo Dicrurus montanus	LC	resident	2000	present	A2
Sulawesi Myna Basilornis celebensis	LC	resident	2000	present	A2

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2004) may differ.

Year	Protected Area	Designation	% overlap with IBA
-	Gunung Dua Saudara	Cagar Alam	74
1929	Batu Putih	Taman Wisata Alam	6
1932	Gn. Duasaudara	Nature Reserve	74
1978	Tangkuban Perahu	Nature Recreation Park	100
1981	Batu Angus	Taman Wisata Alam	7

Habitat1	Habitat detail	% of IBA
Forest		80

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Tangkoko Dua Sudara (Indonesia). Downloaded from https://datazone.birdlife.org/site/factsheet/tangkoko-dua-sudara-iba-indonesia on 25/11/2024.