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Song & Call Comparison
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Song & Call Comparison
Sumatran Ground-cuckoo
Song
Deep, resonant whistled call; melodic notes with carrying quality audible through dense woodland habitat.
Dark Hawk-Cuckoo
Song
Loud, raucous call with harsh quality; penetrating notes carrying through dense forest in South Asia.
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Geographic Range & Migration
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Conservation Status Comparison
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Conservation Status
Critically Endangered
Sumatran Ground-cuckoo
Least Concern
Dark Hawk-Cuckoo
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Identification Tips — How to Tell Them Apart
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How to Tell Them Apart
Sumatran Ground-cuckoo
Plumage
Goliath Coucal (large form): very large; dark brown; rich rufous wings; pale buff below; long dark tail; red eye; impressive
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 Each Bird (Descriptions)
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Sumatran Ground-cuckoo (Carpococcyx viridis) — 52–58 cm. Bronzy-green above; pale buff below; bare red-and-yellow facial skin; long decurved bill; heavy build. Critically Endangered; restricted to lowland forest of Sumatra. Non-parasitic; terrestrial. Omnivore. Known from very few records; one of the rarest cuckoos in the world.
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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Related Comparisons
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More Birds in Family
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