En bref

• Scientific Name: Streptoprocne biscutata
• Spanish Name: Vencejo de collar
• Famille : Apodidae
• Known Nicknames: Biscutate Swift, Double-collared Swift
• Average Length: 20–22 cm / 7.9–8.7 in
• Average Weight: 80–100 g / 2.8–3.5 oz
• Wingspan: 45–50 cm / 17.7–19.7 in
• Key Feature: White collar on hindneck and white crescent on upper breast, contrasting with dark brown plumage
• Régime alimentaire principal : Insectivore
• Range: Eastern and central Brazil, adjacent Paraguay and northeastern Argentina
• Habitat: Rocky cliffs, canyons, and mountainous regions near waterfalls and rivers
• Social Structure: Highly Social (nests and roosts in colonies)
• Nesting/Breeding: Rock crevices on cliffs or behind waterfalls
• Statut de conservation : Préoccupation mineure (LC)
• Évolution démographique : Stable

The Biscutate Swift (*Streptoprocne biscutata*) is a master of the skies, a large and powerful swift native to the montane forests and rocky cliffs of eastern Brazil. Instantly recognizable by its unique "biscutate" (two-shielded) pattern, it features a striking white band across the forehead that splits into two distinct patches on the sides of the neck, contrasting sharply with its otherwise sooty-brown to blackish plumage. With long, scythe-like wings and a slightly forked tail, it is built for relentless, high-speed flight, often seen soaring in large, chattering flocks at dawn and dusk. One of its most special features is its remarkable ability to sleep in flight and to enter deep rock crevices and waterfalls at night to roost, clinging vertically with its sharp claws. This aerial specialist feeds exclusively on insects caught on the wing and is known for its loud, piercing calls that echo through its mountainous habitat.

Faits amusants

Biscutate Swifts are so aerial that they likely mate, sleep, and even bathe on the wing, crashing into water surfaces to splash off dust without landing. Their name, *biscutata* (Latin for “double-shielded”), refers to the unique white collar that wraps around their neck in two distinct patches, resembling a pair of shields. Despite being one of the largest swifts in the Americas, they produce a surprisingly high-pitched, chattering call that sounds more like a tiny insect than a bird. They are also known to gather in enormous, swirling flocks at dusk, performing synchronized aerial displays that can number in the thousands, creating a living vortex in the sky.

Habitats et répartition

The Biscutate Swift is primarily found in eastern and central South America, with its range extending from eastern Brazil south through Paraguay and into northeastern Argentina. Its habitat is closely tied to rugged, mountainous terrain and rocky escarpments, where it nests on vertical cliff faces and inside caves or crevices. It frequents open to semi-open areas including cerrado savanna, upland grasslands, and forest edges, often foraging over rivers, lakes, and forest clearings. During the non-breeding season, these swifts may disperse more widely but remain within the same general geographical region, avoiding dense, closed-canopy rainforest interiors.

Comportements & Reproduction

The Biscutate Swift is a highly social species, often forming large, noisy flocks that roost and forage together. During the breeding season, which typically occurs from October to February, pairs are monogamous for that cycle, though they may not remain so across years. Mating is preceded by dramatic aerial chases and synchronized flight displays, where males pursue females at high speeds before coupling occurs in mid-air. They nest colonially on vertical cliff faces or in rocky crevices, often near waterfalls, using a shallow cup of saliva and plant material glued to the rock. A unique reproductive strategy involves both parents sharing incubation duties for the single white egg, and they may reuse the same nest site for multiple seasons. Chicks are altricial and fledged after about 40 days, with parents continuing to feed them on the wing for a brief period post-fledging.

Alimentation

The Biscutate Swift is an exclusively insectivorous bird, feeding entirely on a wide variety of flying insects captured in mid-air during sustained, high-speed flight. Its diet primarily consists of ants, beetles, flies, and winged termites, which it often hunts at high altitudes, sometimes reaching several hundred meters above the ground. An interesting fact about its feeding behavior is that it forages almost continuously from dawn until dusk, rarely landing except to roost or nest, as its short, weak legs make perching difficult. Another notable aspect is that during periods of inclement weather or cold fronts, when flying insects become scarce, the Biscutate Swift can enter a state of torpor, dramatically lowering its metabolic rate to conserve energy until prey becomes available again.

Couleurs

The Biscutate Swift is predominantly dark brown to sooty black overall, with a distinctive, narrow white or pale gray collar across the nape that does not extend to the sides of the neck. Its most unique marking is a pair of small, crescent-shaped white patches on the sides of the forehead, which are often visible only at close range. This swift lacks bold patterns or camouflage adaptations, relying instead on its uniformly dark plumage for concealment against the sky and rocky cliff faces where it nests.

Distribution Map

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

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