Coucou nain

En bref

  • Scientific Name: Coccycua pumila
  • Spanish Name: Cuco enano
  • Famille : Cuculidae
  • Known Nicknames: Dwarf Cuckoo
  • Average Length: 20–23 cm / 8–9 in
  • Average Weight: 25–30 g / 0.9–1.1 oz
  • Wingspan: 28–32 cm / 11–13 in
  • Key Feature: Small size, rufous wings, and black-and-white barred underparts
  • Régime alimentaire principal : Insectivore
  • Range: Northern South America (Colombia, Venezuela, Guyana, Brazil, Ecuador, Peru, Bolivia)
  • Habitat: Lowland tropical forests, forest edges, and gallery forests
  • Structure sociale : Solitaires ou en couples
  • Nesting/Breeding: Nests in trees; builds a cup-shaped nest
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Dwarf Cuckoo (*Coccycua pumila*) is a diminutive marvel of the Neotropics, measuring just 20 centimeters long—making it one of the smallest cuckoos in the world. Its general appearance is sleek and understated, with a warm brown back, a pale buffy breast, and a long, graduated tail tipped with white, which it often cocks upward like a wren. Its most unique characteristic is its specialized feeding behavior: unlike many cuckoos that chase large caterpillars, this species forages like a tiny woodpecker, clinging to tree trunks and branches to pry off bark and moss in search of hidden insects and spiders. A special feature is its subdued, ventriloquial call—a series of soft, descending whistles that seem to come from nowhere, making it far easier to hear than to spot in the dense rainforest canopy.

Faits amusants

Despite its name, the Dwarf Cuckoo is a master of stealth, not just in size but in behavior. It is a dedicated brood parasite, laying its eggs in the nests of spinetails and other small birds, but with a twist: its chicks are born with a specialized, sharp egg-tooth that they use to physically puncture and kill the host’s own eggs or nestlings, ensuring they monopolize all the food. Another quirky adaptation is its call—a surprisingly loud, descending series of whistles that sounds less like a bird and more like a small, frantic flute, often given in duet pairs.

Habitats et répartition

The Dwarf Cuckoo is found in a relatively restricted range across northern South America, primarily within the Amazon Basin. Its habitat consists almost exclusively of lowland tropical rainforest, particularly favoring dense, humid terra firme forests that are not subject to seasonal flooding. It is also known to inhabit river-edge forests and forest clearings with thick undergrowth, but it generally avoids open savannas and heavily degraded areas. The species' distribution spans from eastern Colombia and southern Venezuela through the Guianas, and into northern Brazil, extending eastward to the Amazon River delta. It occurs at elevations typically below 500 meters.

Comportements & Reproduction

The Dwarf Cuckoo is a brood parasite, laying its eggs in the nests of other bird species, such as wrens and tanagers. It does not build its own nest, incubate eggs, or raise young. Mating is likely monogamous during a breeding season, with pairs forming temporary bonds to coordinate parasitic laying. The female quickly deposits a single egg into a host’s nest, often removing or damaging one of the host’s eggs to reduce competition. Socially, they are solitary or found in pairs, avoiding large groups. This strategy allows them to invest energy solely in egg production, leaving all parental care to unwitting hosts.

Alimentation

The Dwarf Cuckoo (Coccycua pumila) is an insectivorous bird with a diet composed almost exclusively of large, hairy caterpillars, which it skillfully extracts from the foliage of the forest canopy and understory. A fascinating adaptation is its ability to consume these highly toxic and urticating caterpillars that most other birds avoid, likely due to a specialized digestive system that neutralizes the irritating hairs and chemical defenses. Unlike many cuckoo species, it does not regularly supplement its diet with fruit, small vertebrates, or other arthropods, making it a highly specialized predator of Lepidoptera larvae. This exclusive reliance on caterpillars also makes its feeding behavior remarkably methodical, as it often beats captured prey against a branch to remove gut contents or harmful spines before swallowing.

Couleurs

The Dwarf Cuckoo (Coccycua pumila) is predominantly rufous-brown above with a pale buffy throat and breast, transitioning to a whitish belly. Its most distinctive feature is a broad, blackish subterminal band across the tail feathers, with white tips, creating a bold barred pattern. The wings are plain rufous without strong markings, and the bird lacks any iridescence or stark facial patterns, relying on its overall drab, earth-toned coloration for camouflage within dense tropical foliage.