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Side-by-Side Comparison

Attribute	Sulawesi Brush Cuckoo	Dark Hawk-Cuckoo
Scientific Name	Cacomantis virescens	Hierococcyx bocki
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Not Evaluated	Least Concern
Length	—	—
Wingspan	—	35.9 cm (14.1 in)
Weight	—	137.0 g (4.83 oz)
Diet	--	--
Clutch Size	--	--
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🌲 Forest

Sulawesi Brush Cuckoo only

None

Dark Hawk-Cuckoo only

None

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Song & Call Comparison

Sulawesi Brush Cuckoo

Song

Loud, far-carrying resonant call; deep hollow notes given repeatedly from forest perch. Vocalization pattern typical of this species in its native habitat.

Dark Hawk-Cuckoo

Song

Loud, raucous call with harsh quality; penetrating notes carrying through dense forest in South Asia.

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Conservation Status

Not Evaluated

Sulawesi Brush Cuckoo

Least Concern

Dark Hawk-Cuckoo

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How to Tell Them Apart

Sulawesi Brush Cuckoo

Plumage

Sulawesi Brush Cuckoo: olive-brown above; pale buff below; long dark tail; yellow-green eye-ring; Sulawesi endemic brush cuckoo

Dark Hawk-Cuckoo

Plumage

Dark Hawk-Cuckoo: dark brown above; pale below with dense dark barring; hawk-like; long barred tail; yellow orbital ring; dark morph

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About These Birds

Sulawesi Brush Cuckoo

Sulawesi Brush Cuckoo (Cacomantis virescens) — 22–25 cm. Brown-olive above; rufous-buff below; yellow orbital skin; graduated tail. Endemic to Sulawesi and nearby islands. Inhabits forest and forest edge. Brood parasite. Insectivore.

Dark Hawk-Cuckoo

Dark Hawk-Cuckoo (Hierococcyx bocki) — 28–31 cm. Dark grey above; pale below with darker streaking; barred tail. Restricted to montane forest of the Malay Peninsula. Brood parasite. Insectivore. Rare; poorly documented.

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