Definition
The plain thornbird (Phacellodomus inornatus) is a species of passerine bird in the ovenbird family Furnariidae. It is native to parts of central and southern South America.
Overview
The plain thornbird inhabits subtropical and tropical dry shrublands, savannas, and the edges of dry forests, often favoring areas with dense low vegetation and thickets. Its range includes eastern Bolivia, central Brazil, Paraguay, and northern Argentina. The species is a resident bird, with no major migratory movements recorded. It constructs a distinctive large, cylindrical nest woven from thorny sticks, which is typically attached to a shrub or low tree. The bird forages mainly on insects and other arthropods, gleaning them from foliage and ground debris.
Etymology / Origin
The generic name Phacellodomus derives from the Greek words phakellos (“bundle” or “pack”) and domos (“house”), referencing the bird’s habit of building elaborate stick nests. The specific epithet inornatus is Latin for “unadorned” or “plain”, reflecting the bird’s relatively uniform brownish plumage compared with other, more conspicuously marked thornbird species. The common name “thornbird” refers to the use of thorny twigs in its nest construction.
Characteristics
- Size: Adults measure approximately 15–17 cm (6–6.7 in) in length and weigh about 20–25 g.
- Plumage: The upperparts are a uniform dull brown, while the underparts are slightly lighter, giving the bird a “plain” appearance. There are no prominent streaks or contrasting markings.
- Bill: Short, slightly curved, and adapted for picking insects from foliage.
- Voice: Calls consist of a series of sharp, metallic “tsip” notes, often repeated in quick succession; the song is a melodious, repetitive series of notes used for territorial display.
- Reproduction: The nest is a conspicuous, elongated structure made of intertwined thorny sticks, measuring up to 30 cm in length. A typical clutch contains two to three white eggs, which are incubated by both parents for about 16–18 days. Both sexes participate in feeding the nestlings.
Related Topics
- Thornbirds (genus Phacellodomus): A group of Furnariidae birds known for their elaborate stick nests, including the rufous‑tailed thornbird (P. rufifrons) and the striped thornbird (P. lineatus).
- Furnariidae (ovenbirds): A diverse Neotropical family of small to medium-sized insectivorous birds, many of which build mud or stick nests.
- South American dry shrubland ecosystems: The primary habitat type supporting the plain thornbird and numerous other specialized avian species.
Note: The information presented reflects current ornithological knowledge as of 2024. Where precise measurements or behavioral details are not extensively documented, the description is based on the best available data from related species within the genus.