<trp-post-container data-trp-post-id='360658'>Rusty-backed Spinetail

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En bref

  • Scientific Name: Cranioleuca vulpina
  • Spanish Name: Pijuí de lomo rufo
  • Family: Furnariidae
  • Known Nicknames: Rusty-backed Spinetail
  • Average Length: 14–15 cm / 5.5–5.9 in
  • Average Weight: 14–18 g / 0.49–0.63 oz
  • Envergure : N/A
  • Key Feature: Rufous-chestnut back and crown, contrasting with pale supercilium and whitish throat
  • Régime alimentaire principal : Insectivore
  • Range: Amazon Basin (Brazil, Bolivia, Peru, Colombia, Venezuela, and the Guianas)
  • Habitat: River-edge forest, várzea, and swampy woodlands near water
  • Social Structure: Usually solitary or in pairs
  • Nesting/Breeding: Cavity in a tree or bank, lined with soft plant material
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Rusty-backed Spinetail (*Cranioleuca vulpina*) is a small, lively bird of South American river-edge forests, named for its most striking feature: a rich, fox-like rufous back and crown that contrasts sharply with its pale, buffy underparts and whitish throat. A master of dense, tangled vegetation, it is a member of the ovenbird family, and its long, graduated tail—often cocked jauntily upward—is tipped with sharp, spine-like feather shafts that help it brace against tree trunks as it gleans insects from bark and leaves. Its special adaptation includes a thin, slightly decurved bill perfect for probing crevices, and a distinctive, high-pitched trilling song that echoes through gallery forests, making this agile, acrobatic forager a vibrant and elusive gem for birdwatchers.

Faits amusants

Despite its unassuming plumage, the Rusty-backed Spinetail has a quirky habit of twitching its tail sideways like a nervous metronome, a behavior thought to flush out hidden insects from bark crevices. It builds a remarkably large, spherical nest of sticks—often over a foot in diameter—with a side entrance tunnel that acts as a predator deterrent, and it frequently decorates the entrance with fresh green leaves, possibly to signal nest occupancy or repel parasites. This bird is also a master of the "reverse climb," using its stiff, pointed tail feathers as a prop to scurry headfirst down tree trunks, a skill that sets it apart from many other insectivores.

Habitats et répartition

The Rusty-backed Spinetail inhabits lowland tropical and subtropical moist forests, primarily favoring gallery forests along river edges, seasonally flooded forests (várzea), and dense secondary growth near watercourses. It is particularly associated with tangled understory vegetation, thickets, and bamboo stands within these humid environments, often remaining close to water. Geographically, its range spans across central and northern South America, including much of the Amazon Basin, from eastern Peru and northern Bolivia through western and central Brazil, extending into the Guianas and parts of Colombia and Venezuela. It is generally found at low elevations, typically below 500 meters.

Comportements & Reproduction

The Rusty-backed Spinetail is monogamous, with pairs defending small territories year-round. Their social structure is simple, centered on the bonded pair, though they may join mixed-species foraging flocks outside the breeding season. Courtship involves chases and duet calling, and the nest is a unique, spherical structure woven from twigs and leaves, often suspended from a branch tip over water. Both sexes collaborate to build the nest, incubate the clutch of two to three eggs, and feed the chicks. A notable reproductive strategy is the use of a side entrance tunnel, which may help deter predators and parasites; the pair often reuses or refurbishes the same nest for multiple broods.

Alimentation

The Rusty-backed Spinetail is an insectivorous bird, meaning its diet consists almost exclusively of various arthropods. It forages actively in the understory and mid-levels of forests, gleaning prey from bark, leaves, and mossy branches. Its specialized, slender bill is perfectly adapted for probing into crevices and epiphytes to extract hidden spiders, beetles, caterpillars, and other small invertebrates. An interesting fact about its feeding behavior is that it often joins mixed-species foraging flocks, allowing it to exploit food sources flushed out by other birds while benefiting from the group's increased vigilance against predators.

Couleurs

The Rusty-backed Spinetail is predominantly rufous-chestnut above, with a contrasting pale buffy-white throat and breast, and a darker, duller brown tail and wings. Its most distinctive feature is a subtle but clear pale supercilium and a faintly streaked crown, while the underparts transition to a warm buff on the belly. This coloration provides effective camouflage against the reddish bark and leaf litter of its dry forest and scrub habitats.

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