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Side-by-Side Comparison

Attribute	Eastern Koel	Dark Hawk-Cuckoo
Scientific Name	Eudynamys orientalis	Hierococcyx bocki
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Least Concern	Least Concern
Length	—	—
Wingspan	42.0 cm (16.5 in)	35.9 cm (14.1 in)
Weight	239.33333333333334 g (8.44 oz)	137.0 g (4.83 oz)
Diet	--	--
Clutch Size	1	--
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🌲 Forest

Eastern Koel only

None

Dark Hawk-Cuckoo only

None

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Song & Call Comparison

Eastern Koel

Song

Loud, far-carrying resonant call; deep musical notes audible through dense tropical forest in Sumatra.

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

Least Concern

Eastern Koel

Least Concern

Dark Hawk-Cuckoo

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How to Tell Them Apart

Eastern Koel

Plumage

Rufous-throated Bronze-cuckoo: rufous throat contrasting bronze-green above; barred white below; small; distinctive rufous throat

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

Eastern Koel

Eastern Koel (Eudynamys orientalis) — 38–46 cm. Male glossy black; female brown with heavy spotting; pale green bill; red eye; long tail. Ranges across Southeast Asia, New Guinea, and Australia; migrates to Australia in spring. Brood parasite targeting magpies and friarbirds. Frugivore; disperses rainforest seeds.

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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