<trp-post-container data-trp-post-id='359834'>Rufous-backed Wren

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En bref

  • Scientific Name: Campylorhynchus capistratus
  • Spanish Name: Cucarachero dorsirrufo
  • Family: Troglodytidae
  • Known Nicknames: Rufous-naped Wren
  • Average Length: 16–18 cm / 6.3–7.1 in
  • Average Weight: 27–35 g / 0.95–1.23 oz
  • Envergure : N/A
  • Key Feature: Rufous back and nape contrasting with white underparts and bold black-and-white barring on wings and tail
  • Régime alimentaire principal : Principalement insectivore
  • Range: Pacific slope of Central America from southern Mexico to Costa Rica
  • Habitat: Dry to semi-humid scrub, thorn forest, and open woodland with scattered trees
  • Social Structure: Cooperative Breeder / Small Groups
  • Nesting/Breeding: Domed nests built in thorny trees or cacti
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Rufous-backed Wren (*Campylorhynchus capistratus*) is a striking, large wren endemic to the Pacific slopes of Costa Rica and western Panama, known for its bold personality and raucous, chattering calls. Its most distinctive feature is its rich, rufous-brown back and crown, which contrasts sharply with a stark white eyebrow stripe and heavily spotted white throat and chest. A uniquely social species, it lives in cooperative family groups of up to a dozen birds, often seen noisily clambering through dry forests and scrub in search of insects. One of its special features is its massive, football-shaped nest—a bulky, enclosed structure of twigs and grass with a side entrance, which the group builds communally and uses year-round as a sleeping roost. This wren’s confident, inquisitive nature and loud, musical duets make it a charismatic and unforgettable presence in its habitat.

Faits amusants

Despite its modest size, the rufous-backed wren is a vocal powerhouse, with mated pairs often performing intricate, synchronized duets that sound like a single, frenetic bird—a behavior thought to reinforce pair bonds and defend territory. It is also a master of architectural deception, building multiple dummy nests in its thorny scrub habitat to confuse predators, while the real nest is a cozy, globular structure with a side entrance. One quirky adaptation: these wrens frequently engage in “anting,” rubbing ants or other insects on their feathers to use the formic acid as a natural insect repellent and feather conditioner.

Habitats et répartition

The Rufous-backed Wren inhabits arid and semi-arid tropical environments, primarily found in dry deciduous forests, thorn scrub, and open woodlands with cacti and acacia. It prefers areas with dense, spiny undergrowth and often forages near the ground or in low shrubs. Its geographical range extends along the Pacific slope of Central America, from southern Mexico through Guatemala, El Salvador, Honduras, and into northwestern Costa Rica, generally occurring below 1,500 meters in elevation.

Comportements & Reproduction

Rufous-backed Wrens are cooperative breeders, living in stable family groups that defend territories year-round. A dominant breeding pair is typically assisted by multiple non-breeding helpers, often offspring from previous broods, which aid in nest construction, territory defense, and feeding the young. Mating is monogamous within the pair, but extra-pair copulations have been observed. They build large, domed nests with a side entrance, often placed in thorny trees or cacti for protection. A unique reproductive strategy involves the female laying a clutch of 3–5 eggs, and both parents along with helpers share incubation duties. After hatching, all group members feed the nestlings, which fledge after about 18–20 days. The helpers delay their own reproduction, sometimes for several years, until they inherit a territory or a breeding vacancy arises.

Alimentation

The Rufous-backed Wren is primarily insectivorous, foraging actively in pairs or small family groups within the understory and on the ground of dry forests and scrublands. Its diet consists largely of insects and other arthropods, including beetles, caterpillars, ants, grasshoppers, and spiders, which it captures by gleaning from bark, leaves, and leaf litter. An interesting behavioral fact is that these wrens often follow army ant swarms, snapping up insects flushed by the ants, and they have also been observed using their strong bills to pry off loose bark to access hidden prey. While insects dominate, they occasionally supplement their diet with small fruits and seeds, particularly during the non-breeding season when insect availability may decrease.

Couleurs

The Rufous-backed Wren has a striking rufous-brown mantle and upper back, contrasting with a white throat and breast heavily streaked with black. Its head features a bold black-and-white striped pattern, with a white supercilium and black eyestripe. The wings and tail are barred with black and white, while the belly is a pale buff. This disruptive patterning provides camouflage against dappled light in its dry forest and scrub habitat.

Distribution Map

Places linked to this species. A sighting is never guaranteed.