Southern Scrub-Flycatcher

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Quick Facts

  • Scientific Name: Sublegatus modestus
  • Spanish Name: Atrapamoscas matorralero sureño
  • Family: Tyrannidae
  • Known Nicknames: Southern Scrub-Flycatcher
  • Average Length: 13–14 cm / 5.1–5.5 in
  • Average Weight: 11–14 g / 0.39–0.49 oz
  • Wingspan: N/A
  • Key Feature: Pale yellowish belly and two faint wing bars
  • Primary Diet: Insectivore
  • Range: South-central South America (eastern Bolivia, Paraguay, southern Brazil, Uruguay, northern Argentina)
  • Habitat: Dry scrub, savanna, and open woodland
  • Social Structure: Solitary or in pairs
  • Nesting/Breeding: Open cup nest in a shrub or small tree
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Southern Scrub Flycatcher (*Sublegatus modestus*) is a subtly captivating bird of South America’s dry forests and scrublands, notable for its understated elegance and modest size (roughly 13 cm long). Its general appearance features a plain, olive-brown back, pale gray throat and breast, and a faint, pale wingbar, with a small, thin bill perfectly adapted for sallying after insects. Unique among its relatives, this species is a master of camouflage, blending seamlessly into its arid habitat, while its special feature is a distinctive, high-pitched “peep” call that often betrays its presence before it is seen. As a partial migrant, it undertakes seasonal movements across the continent, making it a fascinating subject for birdwatchers tracking subtle shifts in avian distribution.

Fun Facts

Despite its unassuming name, the Southern Scrub Flycatcher has a surprisingly aggressive streak—it will fearlessly dive-bomb much larger birds, including hawks and caracaras, that venture too close to its nest. It also possesses a quirky vocal trick: its call, often described as a sharp *pee-urr*, can be ventriloquial, making it sound as if the bird is calling from a different location to confuse predators or rivals. As a master of camouflage, it often freezes completely motionless on a low perch, relying on its streaky brown plumage to blend into the dry scrub rather than fleeing, a behavior that sometimes allows curious humans to approach within arm’s length before it flits away.

Habitats & Distribution

The Southern Scrub Flycatcher inhabits dry to semi-humid scrublands, savannas, and open woodlands, often in areas with dense undergrowth and scattered bushes or low trees. It is also found along forest edges, in second-growth vegetation, and near gallery forests in drier regions. Its geographical range spans central and eastern South America, occurring from eastern Bolivia and southern Brazil through Paraguay and Uruguay, and extending into northern Argentina. It is generally resident within this range, though some local movements may occur in response to seasonal changes.

Behaviours & Reproduction

The Southern Scrub Flycatcher is typically solitary or found in pairs, defending small territories in scrubby or open woodland. Its social structure is simple, with no cooperative breeding or complex hierarchies observed. Mating is monogamous during the breeding season, with males performing a brief, upright song display from exposed perches to attract and retain a mate. Nesting is a unique strategy: the female builds a small, cup-shaped nest in a low fork of a bush or tree, often using spider webs and lichen for camouflage. She lays 2-3 whitish eggs with brown spots, and both parents share incubation and feeding duties. No elaborate courtship rituals or extra-pair copulations have been documented, and the species does not exhibit any known brood parasitism avoidance behaviors beyond typical nest vigilance.

Diet

The Southern Scrub Flycatcher (*Sublegatus modestus*) is an insectivorous bird whose diet consists almost exclusively of a wide variety of small arthropods. It primarily forages by making short, agile flights from a perch to snatch flying insects like flies, moths, and beetles out of the air (hawking), but it also gleans caterpillars, spiders, and other invertebrates from foliage and branches. An interesting fact about its feeding strategy is that it often wags its tail and flicks its wings while perched, a behavior thought to flush hidden prey into view. Additionally, while it is primarily an insect-eater, it has been observed occasionally consuming small berries or seeds during the non-breeding season, making it slightly more opportunistic when insect availability is low.

Colors

The Southern Scrub Flycatcher is primarily a plain, grayish-brown bird with a pale whitish throat and belly, faint olive tinges on the back, and two subtle pale wingbars. It lacks bold markings, relying on its drab, uniform plumage as camouflage in dry scrub and woodland habitats, with a slight yellowish wash on the underparts that blends with sun-dappled leaves.

Distribution Map

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