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Side-by-Side Comparison

Attribute	Whistling Yellowbill	Rufous-winged Ground-cuckoo
Scientific Name	Ceuthmochares australis	Neomorphus rufipennis
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Least Concern	Least Concern
Length	—	—
Wingspan	24.4 cm (9.6 in)	34.1 cm (13.4 in)
Weight	64.2 g (2.26 oz)	381.25 g (13.45 oz)
Diet	--	--
Clutch Size	1-4	--
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🌲 Forest

Whistling Yellowbill only

None

Rufous-winged Ground-cuckoo only

None

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Song & Call Comparison

Whistling Yellowbill

Song

Loud, harsh call with penetrating quality; rough resonant notes carrying through dense forest habitat.

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

Whistling Yellowbill

Least Concern

Rufous-winged Ground-cuckoo

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How to Tell Them Apart

Whistling Yellowbill

Plumage

Blue Coua: brilliant turquoise-blue overall; darker wings; bare facial skin; long graduated tail; Madagascar endemic; spectacular blue

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

Whistling Yellowbill

Whistling Yellowbill (Ceuthmochares australis) — 30–35 cm. Very similar to Chattering Yellowbill — grey plumage; yellow bill; long tail — but distinguished by its melodic whistled song rather than chattering calls. Found in forest and forest edge in East and Southeast Africa from Kenya to Mozambique. Non-parasitic. Insectivore.

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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