Orange-eyed Thornbird

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Quick Facts

  • Scientific Name: Phacellodomus erythrophthalmus
  • Spanish Name: Pijuí ojianaranjado
  • Family: Furnariidae
  • Known Nicknames: Red-eyed Thornbird, Red-eyed Spinetail
  • Average Length: 16–18 cm / 6.3–7.1 in
  • Average Weight: 20–28 g / 0.7–1.0 oz
  • Wingspan: N/A
  • Key Feature: Bright orange-red iris surrounded by a dark facial mask
  • Primary Diet: Primarily Insectivore
  • Range: Eastern Brazil (Bahia to Santa Catarina)
  • Habitat: Bamboo thickets and humid montane forest understory
  • Social Structure: Monogamous pairs or small family groups
  • Nesting/Breeding: Large stick nest suspended from branches
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Orange-eyed Thornbird (*Phacellodomus erythrophthalmus*) is a striking, medium-sized furnariid endemic to the scrublands and arid valleys of western Peru and northern Chile. Its most arresting feature is its name—a vivid, fiery orange-red iris that contrasts sharply with its otherwise understated plumage of warm browns, rufous tones, and a pale, streaked throat. True to its genus, it constructs an enormous, thorny, communal-looking stick nest high in cacti or trees, a fortress-like structure that serves as both a breeding chamber and a roosting shelter. A master of its harsh desert habitat, this bird is often seen clambering acrobatically through spiny vegetation, its loud, chattering calls echoing across the dry landscape. Unlike many of its relatives, it possesses a notably heavy, slightly curved bill, an adaptation for prying under bark and extracting insects with surgical precision.

Fun Facts

The Orange-eyed Thornbird is a master of architectural deception, building massive, multi-chambered stick nests that can weigh up to 10 kilograms and are often used year-round as a communal roost for multiple generations. Unlike most birds, it frequently incorporates sharp, thorny twigs into the nest’s entrance tunnel to deter predators like snakes and monkeys, creating a literal spiky security system. A quirky adaptation is its habit of “renovating” old nests by adding fresh material on top each breeding season, resulting in spherical, haystack-like structures that can collapse under their own weight if not maintained. Despite its thorny home, it has a surprisingly soft, musical song that it performs in duets with its mate, often while nervously flicking its tail.

Habitats & Distribution

The Orange-eyed Thornbird inhabits dry to semi-arid scrublands, including caatinga vegetation and thorny woodlands, often near watercourses. It is also found in forest edges, second-growth thickets, and degraded areas with dense shrubbery. This species has a restricted geographical range in eastern Brazil, occurring primarily in the states of Bahia, Minas Gerais, and Goiás, with some records in adjacent regions. Its distribution is centered on the interior of the Brazilian Northeast, extending into the northern portion of the Cerrado biome.

Behaviours & Reproduction

The Orange-eyed Thornbird is typically monogamous, with pairs forming long-term bonds that persist across multiple breeding seasons. Socially, it lives in small, stable family groups, often consisting of a breeding pair and their offspring from previous broods, which may assist in defending the territory and constructing the nest. Mating involves mutual displays and duets, reinforcing the pair bond. Its most distinctive reproductive strategy is the construction of a massive, elaborate nest made of sticks, often placed high in a tree or on a man-made structure. This nest, which can be over a meter long and is entered from a tunnel at the bottom, serves as a year-round roosting site and is continuously added to over many years, sometimes becoming a communal structure for the extended family. The female typically lays 3-4 eggs, and both parents, along with helpers, feed the chicks, which fledge after about three weeks.

Diet

The Orange-eyed Thornbird is primarily insectivorous, foraging actively in the tangled undergrowth and lower to mid-levels of its forest and scrubland habitat. Its diet consists mainly of a wide variety of small arthropods, including beetles, caterpillars, ants, and spiders, which it gleans from leaves, branches, and bark with quick, precise movements. Interestingly, while insects form the bulk of its nutrition, this species will also occasionally supplement its diet with small fruits and seeds, particularly during the non-breeding season when insect prey may be less abundant. Another notable fact is that it often forages in pairs or small family groups, sometimes joining mixed-species flocks to increase its foraging efficiency, and it is known to cling upside-down to twigs and leaves to access hidden prey, a behavior more typical of much smaller birds.

Colors

The Orange-eyed Thornbird has a mostly plain, warm brown upper body and paler, buffy underparts, with a distinctive rusty-rufous crown and nape. Its most striking feature is the bright orange-red iris, which contrasts sharply with its otherwise subdued plumage. It lacks bold markings or patterns, relying on its cryptic brown coloration for camouflage within the thorny scrub and dry forests it inhabits.

Distribution Map

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