<trp-post-container data-trp-post-id='363215'>Olive Spinetail

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En bref

  • Scientific Name: Cranioleuca obsoleta
  • Spanish Name: Curutié oliváceo
  • Family: Furnariidae
  • Known Nicknames: Olive-colored Spinetail
  • Average Length: 13–15 cm / 5.1–5.9 in
  • Average Weight: 13–17 g / 0.46–0.60 oz
  • Wingspan: 18–22 cm / 7.1–8.7 in
  • Key Feature: Rufous crown, wings, and tail contrasting with olive-brown upperparts and an indistinct pale supercilium
  • Régime alimentaire principal : Insectivore
  • Range: Southeastern South America, including southern Brazil, eastern Paraguay, and northeastern Argentina
  • Habitat: Humid subtropical and tropical forests, Araucaria moist forests, and gallery forest edges
  • Social Structure: Solitary, in pairs, or participating in mixed-species foraging flocks
  • Nesting/Breeding: Large, globular nests constructed of moss, twigs, and lichen suspended in trees
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Olive Spinetail (*Cranioleuca obsoleta*) is a charming, elusive songbird native to the lush canopy of South America's Atlantic Forest. True to its name, this small member of the ovenbird family features a subtle olive-brown back that contrasts beautifully with its most striking characteristics: a vibrant, rufous-chestnut crown, wings, and tail. What makes the Olive Spinetail truly remarkable is its specialized, stiff-shafted tail feathers, which it uses as a supportive prop to acrobatically scale vertical branches while foraging for insects. Highly active and social, this bird is often spotted darting through mixed-species flocks, and it is known for its impressive architectural skills, constructing large, globe-shaped nests of moss and twigs suspended high in the forest understory.

Faits amusants

The Olive Spinetail is a high-canopy acrobat that frequently hangs completely upside down to snatch insects from the undersides of leaves. True to its name, it possesses stiff, spiky tail feathers that act as a natural kickstand, propping the bird upright against tree trunks just like a woodpecker. Furthermore, this tiny bird is an incredibly ambitious architect, constructing massive, messy dome-shaped nests of moss and twigs that dangle from branch tips and look hilariously oversized for such a small creature.

Habitats et répartition

The geographical range of this species is concentrated in the Atlantic Forest region of South America. It is distributed across southeastern and southern Brazil, spanning from Minas Gerais and São Paulo south to Rio Grande do Sul, and extends into eastern Paraguay and northeastern Argentina, primarily in the province of Misiones. Within this range, it primarily inhabits the canopy and mid-story of humid subtropical and tropical moist lowland forests, as well as montane forests and high-altitude *Araucaria* woodlands. It is also commonly found in gallery forests, secondary growth, and degraded forest edges, demonstrating a tolerance for modified habitats.

Comportements & Reproduction

Active and highly arboreal, this species is typically observed foraging in pairs or small family groups, frequently joining mixed-species flocks in the forest canopy. They navigate branches and foliage acrobatically, searching for insects and other small invertebrates within moss, bark crevices, and epiphytes. Communication within pairs is maintained through frequent, buzzy vocalizations, which help reinforce their social bonds and coordinate their movements through the dense foliage. During the breeding season, monogamous pairs collaborate to construct a large, bulky, globular nest made of moss, twigs, and lichen, usually suspended from or wedged into a tree branch. The female lays a clutch of two to three eggs inside this secure chamber. Both parents share incubation duties and cooperatively provision the nestlings, a reproductive strategy that maximizes chick survival in their humid forest habitat.

Alimentation

The Olive Spinetail (*Cranioleuca obsoleta*) is primarily an insectivorous bird whose diet consists of a variety of small invertebrates, including beetles, caterpillars, ants, and spiders. An interesting aspect of its feeding behavior is its highly acrobatic foraging style; it actively searches for prey along branches, twigs, and within epiphytes, moss, and bark crevices, frequently hanging upside down to glean insects from the undersides of leaves. Furthermore, this species rarely hunts alone, choosing instead to join mixed-species feeding flocks in the forest canopy and subcanopy, a cooperative strategy that helps flush out hidden insects and increases its overall foraging success.

Couleurs

The Olive Spinetail features drab olive-brown upperparts and dull grayish-olive underparts that provide excellent camouflage within dense foliage. It is characterized by a dull rufous crown, wings, and tail, complemented by a faint, pale supercilium. This muted, overall brownish-olive coloration lacks bold markings, helping the bird blend seamlessly into its forest canopy habitat.

Distribution Map

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