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Side-by-Side Comparison

Attribute	Javan Coucal	Dark Hawk-Cuckoo
Scientific Name	Centropus nigrorufus	Hierococcyx bocki
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Vulnerable	Least Concern
Length	—	—
Wingspan	41.3 cm (16.3 in)	35.9 cm (14.1 in)
Weight	244.4 g (8.62 oz)	137.0 g (4.83 oz)
Diet	--	--
Clutch Size	1-3	--
Population Trend	—	—

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Habitat Comparison

Shared Habitats

None

Javan Coucal only

🏖️ Coastal 🌿 Wetland

Dark Hawk-Cuckoo only

🌲 Forest

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Song & Call Comparison

Javan Coucal

Song

Loud, far-carrying melodic call; clear resonant notes given repeatedly from dense forest in Southeast Asia.

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

Vulnerable

Javan Coucal

Least Concern

Dark Hawk-Cuckoo

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How to Tell Them Apart

Javan Coucal

Plumage

Rufous Coucal: entirely rich rufous-brown overall; long dark graduated tail; red eye; monochromatic rufous; Philippine endemic

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

Javan Coucal

Javan Coucal (Centropus nigrorufus) — 40–44 cm. Rufous-chestnut wings; black head and underparts; long tail. Endemic to Java, Indonesia, in lowland forest, dense scrub, and wetland edges. Non-parasitic. Omnivore. Vulnerable; severely threatened by Java's extreme habitat loss.

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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