Polystictus Superciliaris

Grey-Backed Tachuri

Rocky grasslands with scattered shrubs, brushy deserted pastures, and high-altitude shrubland

The Grey-backed Tachuri is a diminutive bird, measuring approximately 9.5 to 10 centimeters in length and weighing around 6 grams. It features a gray crown with a subtle crest, a white supercilium (eyebrow line), and a white eye ring. Its upperparts are brownish-gray, while the underparts exhibit a pinkish-buff hue. The tail is dusky in color. These characteristics, combined with its small size, make it a distinctive species within its habitat.

Grey-Backed Tachuri
Population:Believed to be decreasing; exact numbers unknown
Generation Length:2-3 years
Average Weight:Approximately 6 grams
Average Length:9.5 to 10 cm
Lifespan:4-5 years
Diet:Primarily insects
Conservation Status:Least Concern (LC)
Echological Profile

Endemic to eastern Brazil, the Grey-backed Tachuri inhabits rocky grasslands known as campos rupestres, which are interspersed with shrubs. It is also found in abandoned, brushy pastures and, at higher elevations, in grasslands and along the edges of cloud forests. Its range extends from central Bahia through northern Minas Gerais to northern Paraná, with occurrences in scattered locations beyond these areas. The species resides at elevations between 900 to 2,100 meters, favoring open areas with ample perching sites.

An insectivore by nature, the Grey-backed Tachuri primarily feeds on various insects. It typically forages alone, though it may occasionally be observed in pairs or small groups. The bird perches conspicuously atop grasses or shrubs, scanning for prey. Upon spotting an insect, it may sally forth in short flights just above the vegetation to capture it, often employing a hover-gleaning technique. This feeding behavior ensures it effectively exploits the arthropod resources within its environment.

Breeding occurs between July and September. The nest is a small cup constructed from rootlets and moss, usually situated in the fork of a small shrub. Clutch size consists of one or two eggs. Specific details regarding incubation periods, fledging times, and parental care remain undocumented, indicating a need for further research into the reproductive ecology of this species.

Despite being classified as Least Concern by the IUCN, the Grey-backed Tachuri faces threats from habitat loss, primarily due to the conversion of land for cattle ranching. Although it can persist in partially degraded areas, ongoing habitat degradation poses a risk to its populations. Conservation efforts should focus on preserving its natural habitats and mitigating the impacts of agricultural expansion.

A Taxonomy for All Living Things
Classifications
Domain
Eukaryota
Kingdom
Animalia
Phylum
Chordata
Class
Aves
Family
Tyrannidae
Genus
Polystictus
The Key Attributes

Features

  • Movement:

    Perches high in grass or shrubs; capable of short flights just above vegetation

  • Territorial Behavior:

    Not specified

  • Speed:

    Not specified

  • Diet:

    Insectivore


  • Physical Features:
    • Gray crown with a short crest
    • White supercilium and eye ring
    • Brownish-gray upperparts
    • Pinkish-buff underparts
    • Dusky tail
  • Primary Senses:
    • Sight
Understanding Habitat and Range

Geography

  • Habitat:

    Rocky grasslands with scattered shrubs, brushy deserted pastures, and high-altitude shrubland

  • Migration Patterns:

    Non-migratory

  • Geographical Range:

    Endemic to eastern Brazil, primarily in central Bahia to northern Paraná

  • Climate Preferences:

    Subtropical to tropical high-altitude regions

Navigating the Wilderness

In the wild

  • Predators:

    Not specified

  • Prey:

    Insects

  • Feeding Behavior:

    Gleans insects from perches; makes short flights to hover-glean

  • Diet:

    Primarily insects


  • Defensive Mechanisms:
    • Camouflage within grasslands and shrubs
  • Preferred Food Sources:
    • Various insects
Insights Into Reproduction

Mating

  • Mating System:

    Not specified

  • Number of Offspring:

    One or two eggs per clutch

  • Incubation Period:

    Not specified


  • Parental Involvement:
    • Not specified
Wild Fun for Young Explorers
Youngsters Section
Grey-Backed Tachuri
Fun Fact

The Grey-backed Tachuri is known for its distinctive song, a nervous, sustained 'tititi---' interrupted by a toneless 'purrrrr' trill.

This vocalization, along with its unique appearance, makes it a notable species within its native range in Brazil.

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