Viréo à calotte brune

En bref

  • Scientific Name: Vireo leucophrys
  • Spanish Name: Vireo gorra parda
  • Family: Vireonidae
  • Known Nicknames: Brown-capped Greenlet
  • Average Length: 11.5–13 cm / 4.5–5.1 in
  • Average Weight: 10–14 g / 0.35–0.49 oz
  • Wingspan: 18–20 cm / 7.1–7.9 in
  • Key Feature: Olive-green upperparts with a distinct brownish cap and whitish supercilium
  • Régime alimentaire principal : Principalement insectivore
  • Range: Highlands from southern Mexico (Chiapas) through Central America to western Panama
  • Habitat: Montane evergreen forest, cloud forest, and forest edges, typically at 900–3000 m elevation
  • Social Structure: Solitary or in pairs; sometimes joins mixed-species foraging flocks
  • Nesting/Breeding: Cup-shaped nest suspended from a fork in a tree branch
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Brown-capped Vireo (*Vireo leucophrys*) is a lively, olive-green songbird of Central and South American highland forests, distinguished by its striking head pattern: a crisp white eyebrow (supercilium) contrasts sharply with a rich, chestnut-brown crown and dark eyeline. Slightly larger than many other vireos, it has a stout, slightly hooked bill and pale yellow underparts that brighten toward the belly. A special feature is its persistent, burry song—a series of short, questioning phrases—which it delivers from mid-canopy perches while actively foraging for insects and berries. Unlike many vireos, this species often joins mixed-species flocks, and its preference for mossy cloud forests at elevations between 1,500 and 3,000 meters makes it a sought-after sighting for birdwatchers exploring the Andes from Colombia to Bolivia.

Faits amusants

The Brown-capped Vireo is a master of ventriloquism, singing in a way that makes its location incredibly difficult to pinpoint, often tricking both predators and birders. It has a quirky habit of constantly flicking its wings while foraging, a behavior thought to flush out hidden insects. Unlike many birds that build open cup nests, this vireo constructs a deep, hanging pouch suspended from a forked branch, which helps protect its eggs from snakes and monkeys. It also frequently joins mixed-species feeding flocks in the cloud forest, acting as a sentinel with its sharp, scolding alarm calls.

Habitats et répartition

The Brown-capped Vireo is found in highland forests from southern Mexico through Central America to western Panama, with an isolated population in the northern Andes of Colombia. Its primary habitat consists of humid montane evergreen forests and cloud forests, typically between 1,200 and 2,500 meters in elevation. It also inhabits forest edges, second-growth woodlands, and shaded coffee plantations, favoring areas with dense canopy cover and abundant understory vegetation. The species is resident across its range, showing no migratory movements, though it may make minor elevational shifts in response to seasonal food availability.

Comportements & Reproduction

The Brown-capped Vireo is typically monogamous during the breeding season, with pairs forming shortly after males establish territories through persistent singing. Males defend these territories vigorously, often engaging in chases and vocal duels with rivals. The pair works together to build a deep, cup-shaped nest suspended from a forked branch, usually in dense understory vegetation. Females lay 2-3 eggs, and both parents share incubation duties for about two weeks. A unique reproductive strategy involves the use of "decoy nests"—incomplete or empty nests constructed nearby—which may confuse predators and brood parasites like cowbirds, reducing the risk of egg loss. After hatching, both parents feed the chicks, and the young fledge in approximately 12-14 days. In some populations, pairs may raise two broods per season, with the male continuing to feed the first brood while the female initiates a new clutch.

Alimentation

The Brown-capped Vireo (Vireo leucophrys) is primarily insectivorous, with a diet composed almost entirely of small arthropods such as caterpillars, beetles, spiders, and various flying insects like flies and wasps. It forages actively in the mid-to-upper canopy of cloud forests, gleaning prey from leaves and twigs or making short aerial sallies to catch insects in flight. An interesting fact about its diet is that it often consumes hairy caterpillars that many other birds avoid, likely due to its ability to process or discard the irritating setae. Additionally, while insects dominate its diet year-round, it will occasionally supplement its intake with small berries and fruits, particularly during the non-breeding season when insect prey may be less abundant.

Couleurs

The Brown-capped Vireo has an olive-green back and wings, a distinct warm brown crown, and a white throat and breast that contrast with pale yellow flanks and undertail coverts. Its face features a bold white supercilium (eyebrow stripe) and a dark line through the eye, with no wing bars. This coloration provides camouflage in the dappled light of its montane forest habitat, breaking up its silhouette among leaves and branches.