En bref

• Scientific Name: Sirystes sibilator
• Spanish Name: Siristes Silbador
• Famille : Tyrannidae
• Known Nicknames: Sibilant Sirystes, Whistling Sirystes
• Average Length: 17–19 cm / 6.7–7.5 in
• Average Weight: 20–28 g / 0.7–1.0 oz
• Envergure : N/A
• Key Feature: Grayish-brown upperparts, whitish underparts, and a distinctive pale supercilium; often perches upright
• Primary Diet: Insectivore (primarily insects and other arthropods)
• Range: South America: Amazon Basin, from eastern Colombia and Venezuela to southern Brazil, Paraguay, and northern Argentina
• Habitat: Humid lowland forests, forest edges, and gallery forests
• Social Structure: Solitary or in pairs; occasionally joins mixed-species flocks
• Nesting/Breeding: Tree cavities (natural or excavated by woodpeckers)
• Statut de conservation : Préoccupation mineure (LC)
• Évolution démographique : Stable

The Sibilant Sirystes (*Sirystes sibilator*) is a striking tyrant flycatcher of South American lowland forests, named for its piercing, whistled call that echoes through the canopy. This slender, medium-sized bird boasts a crisp black-and-white plumage, featuring a dark cap, white throat, and pale underparts, with subtle brownish wings edged in rufous. Its most unique characteristic is its restless, active foraging style—often seen sallying out from high perches to snatch insects mid-air, then returning with a sharp flick of its tail. A special feature is its strong preference for forest edges and clearings, where its sibilant, descending song serves as a reliable acoustic marker for birdwatchers navigating the dense Neotropics.

Faits amusants

Despite its scientific name, the Sibilant Sirystes doesn’t just whistle; it often performs a bizarre "wing-fluttering" display during aggressive encounters, rapidly vibrating its wings while fanning its tail to appear larger and more intimidating. This bird is a dedicated nest-pirate, frequently evicting other species from their cavities by force, then claiming the hole for itself without adding any new lining. It also has a peculiar habit of sallying out from a perch to snatch large insects, then returning to bash them against a branch repeatedly before swallowing, a behavior that produces a distinct tapping sound in the understory.

Habitats et répartition

The Sibilant Sirystes is found across a broad swath of South America east of the Andes, from eastern Colombia and Venezuela through the Guianas, much of Brazil, and into eastern Bolivia, Paraguay, and northern Argentina. Its primary habitat consists of the canopy and edges of lowland humid forests, including terra firme and várzea forests, as well as gallery forests and wooded savannas. It also occupies second-growth woodlands and forest clearings, but generally avoids the interior of dense, undisturbed primary forest.

Comportements & Reproduction

The Sibilant Sirystes is a monogamous tyrant flycatcher, with pairs defending small territories year-round. Courtship involves the male performing aerial displays and vocal duets with the female, reinforcing the pair bond. They construct a cup-shaped nest in a tree cavity or abandoned woodpecker hole, often lining it with soft plant fibers. The female typically lays two to three eggs and incubates them alone for about 15 days, though the male assists in feeding the young after hatching. A unique reproductive strategy is their reliance on pre-existing cavities, which limits breeding density and forces competition for suitable nest sites, sometimes leading to aggressive interactions with other cavity-nesting species. Both parents feed the nestlings for up to three weeks, and fledglings remain dependent on the adults for several more weeks before dispersing.

Alimentation

The Sibilant Sirystes is an insectivorous bird, with its diet consisting almost entirely of a wide variety of arthropods. It actively forages in the mid-to-upper canopy of forests, employing a sit-and-wait strategy where it perches on exposed branches and sallies out to snatch flying insects, such as flies, beetles, and winged ants, directly from the air. Interestingly, it frequently joins mixed-species foraging flocks, a behavior that increases its feeding efficiency by capitalizing on the disturbance of insects caused by other birds. Another notable dietary fact is its specialized foraging technique: while it primarily catches prey on the wing, it also performs "hover-gleaning," briefly hovering to pluck insects from the undersides of leaves, demonstrating a versatile approach to capturing elusive prey.

Couleurs

The Sibilant Sirystes is a tyrant flycatcher with a mostly dark gray head, back, and wings, contrasted by a whitish throat and pale yellow belly. Its wings display bold white edges and a distinct pale wing bar, while the tail is black with white outer tips. This plumage provides camouflage in the dappled light of its forest canopy habitat, with no unique markings beyond its crisp black-and-white facial pattern and a subtle, pale rump patch.

Distribution Map

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

Détails de l'attraction

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