Dark-billed Cuckoo

Quick Facts

Migratory
  • Scientific Name: Coccyzus melacoryphus
  • Spanish Name: Cuclillo piquinegro
  • Family: Cuculidae
  • Known Nicknames: Dark-billed Cuckoo, Ash-colored Cuckoo
  • Average Length: 25–28 cm / 10–11 in
  • Average Weight: 52–60 g / 1.8–2.1 oz
  • Wingspan: 36–40 cm / 14–16 in
  • Key Feature: Black upper mandible and yellow lower mandible with a dark tip
  • Primary Diet: Insectivore (primarily caterpillars, beetles, and orthopterans)
  • Range: South America (Colombia, Venezuela, the Guianas, Brazil, Paraguay, Uruguay, northern Argentina) and Trinidad and Tobago
  • Habitat: Tropical and subtropical lowland forests, forest edges, secondary growth, and mangroves
  • Social Structure: Solitary or in pairs
  • Nesting/Breeding: Shallow cup nest built in a tree or shrub
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Dark-billed Cuckoo (*Coccyzus melacoryphus*) is a sleek, medium-sized bird found in South American forests and woodlands, distinguished by its notably heavy, all-black bill that contrasts sharply with its warm, cinnamon-brown back and pale, buffy underparts. Unlike many cuckoos, it lacks a long, graduated tail, instead sporting a more compact, square-tipped tail with bold white tips on the outer feathers. A unique characteristic is its secretive, skulking behavior, often remaining motionless in dense foliage before making a short, swift flight to capture large caterpillars and insects. Its most special feature is a haunting, descending series of whistled notes—*"pee-pee-pee-pee"*—that echoes through the canopy at dawn and dusk, making it more often heard than seen.

Fun Facts

Despite its name, the dark-billed cuckoo is not always dark-billed—juveniles sport a bright yellow-orange beak that darkens as they mature, a quirky color-shift linked to their diet of hairy caterpillars. It has a bizarre defense mechanism: when threatened, it will suddenly freeze in a rigid, upright posture, blending perfectly into vertical branches like a wooden statue. This species is also a notorious brood parasite, sneaking its eggs into the nests of other birds, but unlike the common cuckoo, it occasionally raises its own young, making it a "semi-parasite" with a flexible family strategy.

Habitats & Distribution

The Dark-billed Cuckoo inhabits a variety of semi-open and forest-edge environments, including tropical deciduous forests, gallery forests, secondary growth, scrublands, and agricultural areas with scattered trees. It avoids dense, humid primary rainforest interiors, preferring drier or more disturbed habitats with a mix of cover and open space. Its geographical range spans much of South America east of the Andes, from eastern Colombia, Venezuela, and the Guianas south through Brazil, Bolivia, Paraguay, and Uruguay to northern Argentina. It is also found on the islands of Trinidad and Tobago, and its range extends west to the Galápagos Islands, where a small resident population exists.

Behaviours & Reproduction

The Dark-billed Cuckoo is typically solitary or found in pairs during the breeding season, with no complex social structure observed. Mating involves a brief courtship where the male may present food to the female. A notable reproductive strategy is its use of brood parasitism, though less frequently than some other cuckoos; it occasionally lays eggs in the nests of other bird species, such as spinetails and tyrant flycatchers. When not parasitizing, the pair builds a shallow stick nest in a tree or shrub, where both parents share incubation duties for about 12–14 days and feed the young after hatching. The species does not exhibit cooperative breeding or extended parental care beyond fledging.

Diet

The Dark-billed Cuckoo is primarily an insectivore, with a diet heavily dominated by large, hairy caterpillars, which many other birds avoid due to their irritating setae. It also consumes a variety of other insects such as grasshoppers, beetles, and cicadas, along with spiders and small snails. Interestingly, this cuckoo will occasionally eat small fruits and berries, especially during the non-breeding season when insect prey may be less abundant. A distinctive feeding behavior is its habit of "picking" caterpillars against a branch to remove their toxic hairs before swallowing, and like many cuckoos, it is a skilled gleaner, methodically searching foliage and branches for hidden prey.

Colors

The Dark-billed Cuckoo has a warm brown back, wings, and tail, with a pale buff or cinnamon underbelly and throat. Its most distinctive feature is a bold black mask extending from the bill through the eye, contrasting with a white supercilium and white tail tips. The black bill is heavy and slightly curved. This coloration provides camouflage in dappled forest light, breaking up the bird’s outline among branches and shadows.