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Side-by-Side Comparison

Attribute	Eastern Koel	Rufous-winged Ground-cuckoo
Scientific Name	Eudynamys orientalis	Neomorphus rufipennis
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Least Concern	Least Concern
Length	—	—
Wingspan	42.0 cm (16.5 in)	34.1 cm (13.4 in)
Weight	239.33333333333334 g (8.44 oz)	381.25 g (13.45 oz)
Diet	--	--
Clutch Size	1	--
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🌲 Forest

Eastern Koel only

None

Rufous-winged Ground-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.

Rufous-winged Ground-cuckoo

Song

Deep, hollow resonant call; powerful low-frequency sound carrying across dense lowland tropical forest floor.

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Conservation Status

Least Concern

Eastern Koel

Least Concern

Rufous-winged Ground-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

Rufous-winged Ground-cuckoo

Plumage

Pheasant Coucal: dark glossy black head and body; rufous-brown wings; strongly barred dark tail; reddish eye; terrestrial habits

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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.

Rufous-winged Ground-cuckoo

Rufous-winged Ground-cuckoo (Neomorphus rufipennis) — 46–50 cm. Bronze-green above; rufous wing panels; pale buff below. Found in humid forest of Venezuela, Guyana, and northern Brazil. Non-parasitic; follows army ants. Insectivore and small vertebrate predator. Rarely encountered; Near Threatened.

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