Sooty-headed Tyrannulet

En bref

  • Scientific Name: Phyllomyias griseiceps
  • Spanish Name: Tiranolete cabecigrís
  • Famille : Tyrannidae
  • Known Nicknames: Sooty-headed Tyrannulet
  • Average Length: 10–11 cm / 3.9–4.3 in
  • Average Weight: 7–9 g / 0.25–0.32 oz
  • Envergure : N/A
  • Key Feature: Sooty-gray crown and nape contrasting with olive-green upperparts
  • Régime alimentaire principal : Insectivore
  • Range: Southern Central America (Panama) to northern and western South America (Colombia, Ecuador, Peru, Venezuela, Brazil)
  • Habitat: Humid lowland and foothill forests, forest edges, and secondary growth
  • Structure sociale : Solitaires ou en couples
  • Nesting/Breeding: Small cup nest in a tree fork or shrub
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Sooty-headed Tyrannulet (*Phyllomyias griseiceps*) is a small, unobtrusive tyrant flycatcher of the Andean foothills, instantly recognizable by its most distinctive feature: a dark, sooty-gray crown that starkly contrasts with its bright olive-green upperparts and pale yellow underparts. A subtle pale eyering and two faint whitish wingbars further define its delicate appearance, while its short, thin bill is perfectly adapted for snatching small insects from foliage. Unlike many of its hyperactive relatives, this species is often observed foraging deliberately in the mid-canopy, emitting a soft, high-pitched *tsip* call that belies its energetic presence. A special feature is its preference for cloud forest edges and secondary growth, where it often joins mixed-species flocks, acting as a quiet but persistent sentinel among the leaves.

Faits amusants

Despite its gloomy common name, the Sooty-headed Tyrannulet sports a surprisingly cheerful lemon-yellow belly and undertail, contrasting sharply with its dusky cap. It is a master of the "hover-glean," snatching insects from the undersides of leaves while fluttering in place like a tiny helicopter, a skill that lets it reach prey other birds miss. Uniquely for a flycatcher, it often joins mixed-species foraging flocks, acting as a nervous sentry that flicks its wings and tail constantly, a behavior thought to flush out hidden insects for the group.

Habitats et répartition

The Sooty-headed Tyrannulet inhabits humid to semi-humid lowland forests, forest edges, and secondary growth, often favoring the canopy and subcanopy of terra firme and várzea forests. It is also found in clearings with scattered trees and along riverine corridors, generally avoiding dense interior forest. Its geographical range spans the western and central Amazon Basin, occurring from eastern Colombia, southern Venezuela, and the Guianas south through eastern Ecuador, Peru, and northern Brazil, extending into northern Bolivia. It is generally resident across this range, with its distribution centered on lowland areas below 1,000 meters in elevation.

Comportements & Reproduction

The Sooty-headed Tyrannulet is generally solitary or found in loose pairs, with no complex social structure observed outside of the breeding season. Mating appears to be monogamous for the duration of the reproductive cycle, with pairs defending a small territory. Courtship involves simple vocal duets and brief chasing flights through the canopy. The female builds a small, cup-shaped nest of moss and plant fibers, typically placed in a tree fork or among epiphytes. Unlike many Neotropical tyrant flycatchers, this species lays a relatively small clutch of just two eggs, which the female incubates alone. Both parents share feeding duties for the altricial young, and there are no documented unique strategies such as cooperative breeding or brood parasitism avoidance beyond standard nest concealment.

Alimentation

The Sooty-headed Tyrannulet is primarily insectivorous, with a diet consisting almost entirely of small arthropods such as beetles, caterpillars, flies, and spiders, which it actively gleans from foliage and twigs in the forest canopy. An interesting fact about its feeding behavior is that it often joins mixed-species foraging flocks, allowing it to exploit a wider range of prey by following larger birds that flush insects from cover. Additionally, unlike many larger flycatchers that sally out from a perch, this tiny tyrant-flycatcher typically forages by hovering briefly to pluck prey from leaves, a technique known as "hover-gleaning," which is energy-intensive but effective for catching stationary insects in dense vegetation.

Couleurs

The Sooty-headed Tyrannulet is a small, inconspicuous bird with a dark gray crown and nape that contrasts with its olive-green back and wings. Its underparts are pale grayish-white, often with a faint yellow wash on the belly. The wings show subtle pale wingbars and edging on the flight feathers. This muted, uniform coloration provides excellent camouflage in the dappled light of its forest canopy habitat, with no bright markings or unique patterns.