Grallaire à nuque rousse

En bref

  • Scientific Name: Grallaria nuchalis
  • Spanish Name: Tororoi nuquicastaño
  • Family: Grallariidae
  • Known Nicknames: Chestnut-naped Antpitta
  • Average Length: 18–20 cm / 7–8 in
  • Average Weight: 65–85 g / 2.3–3.0 oz
  • Envergure : N/A
  • Key Feature: Rich chestnut nape and crown contrasting with olive-brown upperparts and pale underparts
  • Régime alimentaire principal : Principalement insectivore
  • Range: Andes of western Venezuela, Colombia, Ecuador, and northern Peru
  • Habitat: Humid montane forest understory and bamboo thickets
  • Structure sociale : Solitaires ou en couples
  • Nesting/Breeding: Cup-shaped nest on or near the ground, often in a mossy bank or tussock
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Chestnut-naped Antpitta (*Grallaria nuchalis*) is a plump, elusive bird of the Andean cloud forests, renowned for its striking appearance and secretive nature. Standing about 20 centimeters tall, it boasts a rich, chestnut-rufous crown and nape that contrasts vividly with its slate-gray face and upperparts, while its underparts are a soft, whitish-gray with subtle streaking. Its most distinctive feature is its stout, slightly curved bill, perfectly adapted for flipping leaf litter to hunt worms and insects on the damp forest floor. True to the antpitta family, it is far more often heard than seen, delivering a loud, resonant, three-note whistle that echoes through the misty undergrowth, making it a prized target for birdwatchers who must patiently wait for this shy ground-dweller to emerge.

Faits amusants

The Chestnut-naped Antpitta is famously secretive, often more easily heard than seen, as it belts out a loud, clear, descending whistle that sounds almost like a human “whooo-eee.” True to its antpitta nature, it has a quirky habit of “bouncing” or “pumping” its tail and body rhythmically while foraging on the forest floor, a behavior thought to startle insects into moving. It possesses remarkably strong legs and feet, allowing it to hop and scratch through thick leaf litter with surprising speed, but it is a notoriously weak flier, preferring to run away from danger rather than take to the air. Adding to its peculiarity, this species is known to follow army ant swarms, not to eat the ants, but to snatch up the panicked invertebrates fleeing the raid.

Habitats et répartition

The Chestnut-naped Antpitta is found in the humid temperate and subtropical forests of the northern Andes, primarily on the eastern slope of the Cordillera Oriental in Colombia and extending into the western slopes of the Ecuadorian Andes. Its habitat consists of dense, mossy cloud forests with a thick understory of bamboo, ferns, and tangled vegetation, often near streams or in ravines at elevations ranging from approximately 2,200 to 3,300 meters. The species is restricted to a narrow ecological zone where high humidity and frequent mist are characteristic, and it avoids disturbed or fragmented areas, making its distribution highly localized and patchy within its overall range.

Comportements & Reproduction

The Chestnut-naped Antpitta is generally solitary and highly territorial, with pairs maintaining a defined home range year-round. Their social structure is simple, consisting of mated pairs that form long-term bonds, though they are not gregarious and rarely interact with other antpittas outside of the breeding season. Mating begins with the male performing a series of loud, whistled songs to attract a female and defend territory, and once paired, they engage in mutual preening and close following. Nesting is a unique strategy: they construct a bulky, open cup nest in a low tree fork or on a mossy bank, often hidden in dense vegetation. The female typically lays two pale blue eggs, and both parents share incubation duties for roughly 18–20 days. After hatching, the chicks are altricial and are fed by both adults, with the parents using a rapid, quiet delivery method to avoid predators. This species does not exhibit cooperative breeding or any known extra-pair copulation, relying instead on strong pair fidelity and concealed nesting to ensure reproductive success.

Alimentation

The Chestnut-naped Antpitta is an insectivorous bird, with a diet composed primarily of a wide variety of terrestrial invertebrates. Its foraging strategy involves hopping and scratching through the thick, damp leaf litter of the Andean cloud forest floor, using its strong legs and bill to flip over leaves and debris in search of prey. Common food items include beetles, ants, caterpillars, spiders, and earthworms, which it captures with quick, precise pecks. An interesting fact is that this species is known to occasionally follow army ant swarms, not to eat the ants themselves, but to snatch up the numerous insects and other small arthropods that flee the swarm's path, a behavior that allows it to exploit a temporary but rich food source.

Couleurs

The Chestnut-naped Antpitta has a rich rufous-chestnut nape and crown, contrasting with a slate-gray face, throat, and breast, while its belly is a paler, whitish-gray with faint dusky streaks. Its back and wings are olive-brown, providing effective camouflage against the forest floor leaf litter of the Andean cloud forest. A unique feature is the bare, pale-blue skin surrounding its eyes, set off by a dark loral stripe.