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Side-by-Side Comparison

Attribute	Dark Hawk-Cuckoo	Moustached Hawk-Cuckoo
Scientific Name	Hierococcyx bocki	Hierococcyx vagans
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Least Concern	Near Threatened
Length	—	—
Wingspan	35.9 cm (14.1 in)	29.4 cm (11.6 in)
Weight	137.0 g (4.83 oz)	58.2 g (2.05 oz)
Diet	--	--
Clutch Size	--	--
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🌲 Forest

Dark Hawk-Cuckoo only

None

Moustached Hawk-Cuckoo only

None

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Song & Call Comparison

Dark Hawk-Cuckoo

Song

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

Moustached Hawk-Cuckoo

Song

Loud, raucous accelerating call; harsh notes building quickly in urgency given from forest perch. Vocalization pattern typical of this species in its native habitat.

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Conservation Status

Least Concern

Dark Hawk-Cuckoo

Near Threatened

Moustached Hawk-Cuckoo

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How to Tell Them Apart

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

Moustached Hawk-Cuckoo

Plumage

Moustached Hawk-Cuckoo: brown above; white below with rufous barring; moustachial stripe; hawk-like barred pattern; yellow eye-ring

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About These Birds

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.

Moustached Hawk-Cuckoo

Moustached Hawk-Cuckoo (Hierococcyx vagans) — 28–31 cm. Hawk-like; brown above; pale below with rufous-streaked breast; bold moustachial stripe; barred tail. Inhabits hill forest of the Malay Peninsula, Sumatra, and Borneo. Brood parasite; mimics Accipiter sparrowhawks. Insectivore.

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