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Side-by-Side Comparison

Attribute	Puerto Rican Lizard-cuckoo	Dark Hawk-Cuckoo
Scientific Name	Coccyzus vieilloti	Hierococcyx bocki
Order	Cuculiformes	Cuculiformes
Family	Cuculidae	Cuculidae
Conservation Status	Least Concern	Least Concern
Length	—	—
Wingspan	26.4 cm (10.4 in)	35.9 cm (14.1 in)
Weight	86.0 g (3.03 oz)	137.0 g (4.83 oz)
Diet	--	--
Clutch Size	2-3	--
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🌲 Forest

Puerto Rican Lizard-cuckoo only

None

Dark Hawk-Cuckoo only

None

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Song & Call Comparison

Puerto Rican Lizard-cuckoo

Song

Loud, clear whistled call; pure melodic notes carrying through dense humid forest in Southeast Asia.

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

Puerto Rican Lizard-cuckoo

Least Concern

Dark Hawk-Cuckoo

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How to Tell Them Apart

Puerto Rican Lizard-cuckoo

Plumage

Cocos Cuckoo: olive-brown above; pale buffy below; long dark tail; yellowish bill; Cocos Island endemic cuckoo; island species

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

Puerto Rican Lizard-cuckoo

Puerto Rican Lizard-cuckoo (Coccyzus vieilloti) — 38–43 cm. Brown above; grey-buff below; bare red orbital skin; long tail with white spots. Endemic to Puerto Rico in forest and wooded habitat. Non-parasitic; hunts lizards, insects, and nestlings. Considered Vulnerable due to limited range and habitat loss.

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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