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En bref

  • Scientific Name: Vireolanius pulchellus
  • Spanish Name: Vireo esmeralda
  • Family: Vireonidae
  • Known Nicknames: Green Shrike-Vireo, Slaty-capped Shrike-Vireo
  • Average Length: 14–15 cm / 5.5–5.9 in
  • Average Weight: 20–25 g / 0.71–0.88 oz
  • Envergure : N/A
  • Key Feature: Bright olive-green upperparts with a thick, hooked bill and a slate-gray crown
  • Régime alimentaire principal : Principalement insectivore
  • Range: Southern Mexico to western Panama
  • Habitat: Humid lowland and foothill forests, especially canopy and edges
  • Social Structure: Solitary or in pairs; often joins mixed-species flocks
  • Nesting/Breeding: Cup-shaped nest placed in a tree fork
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Green Shrike-Vireo (*Vireolanius pulchellus*) is a striking, stocky songbird of Central and South American lowland forests, instantly recognizable by its vivid, almost neon-green upperparts and bright yellow underparts, which give it an electrifying appearance as it moves through the canopy. A unique feature of this species is its heavy, hooked bill—a trait shared with true shrikes—which it uses to snatch large insects, spiders, and even small lizards, setting it apart from other, more delicate vireos. Its most special characteristic is a loud, piercing, three-note whistle that rings through the treetops, often described as a clear “*whee-whee-whee*,” making it easier to hear than to see. With a bold white eye-ring contrasting against its green face and a relatively short tail, this bird is a master of stealth, often foraging in mixed-species flocks while remaining hidden among the leaves.

Faits amusants

The Green Shrike-Vireo is a master of disguise, often mimicking the calls of other bird species, a quirky behavior thought to confuse predators or deter competition. Unlike most vireos, it has a thick, hooked beak similar to a shrike, which it uses to snatch large insects and even small lizards, then impale them on thorns as a food cache. Its vivid emerald plumage contains a unique structural blue iridescence on the wings, making it appear to shimmer in direct sunlight, a rare adaptation among neotropical songbirds.

Habitats et répartition

The Green Shrike-Vireo inhabits humid tropical lowland and foothill forests, primarily within the canopy and subcanopy of mature evergreen and semi-deciduous woodlands. It is often associated with forest edges, clearings with tall trees, and second-growth woodland adjacent to primary forest, but it generally avoids heavily disturbed areas. Its geographical range extends from southern Mexico through Central America, including Belize, Guatemala, Honduras, Nicaragua, Costa Rica, and western Panama, occurring from sea level up to about 1,200 meters in elevation.

Comportements & Reproduction

The Green Shrike-Vireo is typically observed alone or in pairs, often as part of mixed-species foraging flocks in the forest canopy. Its social structure is loosely monogamous, with pairs defending a small territory during the breeding season. Mating habits are not extensively documented, but courtship likely involves vocal duets and mutual feeding, as seen in related vireonids. The species builds a cup-shaped nest in a tree fork, where the female lays two eggs. Both parents share incubation and feeding duties, but a unique strategy is its use of bulky, hanging moss and spiderweb to camouflage the nest, reducing predation risk.

Alimentation

The Green Shrike-Vireo is primarily an insectivore, with a diet dominated by large, robust insects such as beetles, caterpillars, grasshoppers, and katydids, which it actively hunts by gleaning from foliage and branches in the forest canopy. An interesting fact about its feeding behavior is its aggressive, shrike-like technique of impaling larger prey on thorns or wedging them into bark crevices to tear them apart, a rare adaptation among vireos. While insects form the bulk of its diet, it also supplements its intake with small fruits and berries, especially during the non-breeding season when insect availability declines. Another notable trait is its foraging strategy: it often joins mixed-species feeding flocks, where its loud, repetitive calls help maintain group cohesion while it systematically searches for prey.

Couleurs

The Green Shrike-Vireo is predominantly bright olive-green above with a paler, yellowish-green belly. It has a distinctive blue-gray crown and nape, a bold white eye-ring, and a blackish line through the eye that extends to the bill. Its wings and tail are darker green with subtle yellowish edging, and the throat is pale yellow, providing camouflage in the dappled light of the tropical canopy.