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Side-by-Side Comparison

Attribute	Eastern Koel	Western Koel
Scientific Name	Eudynamys orientalis	Eudynamys scolopaceus
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Least Concern	Least Concern
Length	—	—
Wingspan	42.0 cm (16.5 in)	39.3 cm (15.5 in)
Weight	239.33333333333334 g (8.44 oz)	230.0 g (8.11 oz)
Diet	--	--
Clutch Size	1	2-3
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🌲 Forest

Eastern Koel only

None

Western Koel 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.

Western Koel

Song

Loud, far-carrying nasal call; distinctive penetrating notes audible through dense tropical forest. Vocalization pattern typical of this species in its native habitat.

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Conservation Status

Least Concern

Eastern Koel

Least Concern

Western Koel

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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

Western Koel

Plumage

Shining Bronze-cuckoo: brilliant iridescent golden-green above; white barred below; bronze-green head; reddish eye; small size

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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.

Western Koel

Western Koel (Eudynamys scolopaceus) — 39–46 cm. Male glossy black; female brown with white spots and barred underparts; red eye. Widespread from South Asia through mainland Southeast Asia. Brood parasite targeting crows and mynas. Frugivore and insectivore. Its rising wailing call heralds the Indian summer.

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