En bref

• Scientific Name: Cypseloides fumigatus
• Spanish Name: Vencejo sombrío
• Famille : Apodidae
• Known Nicknames: Sooty Swift
• Longueur moyenne : 13–14 cm / 5,1–5,5 pouces
• Average Weight: 25–32 g / 0.88–1.1 oz
• Wingspan: 30–34 cm / 12–13 in
• Key Feature: Uniform dark sooty-brown plumage with a slightly paler throat
• Primary Diet: Primarily Insectivore (aerial insects)
• Range: Southern South America (Argentina, Chile, and possibly Bolivia)
• Habitat: Temperate forests, open woodlands, and mountainous regions near cliffs and waterfalls
• Social Structure: Social (often found in small flocks, especially during foraging)
• Nesting/Breeding: Rock crevices and behind waterfalls on cliffs
• Statut de conservation : Préoccupation mineure (LC)
• Évolution démographique : Stable

The Sooty Swift (*Cypseloides fumigatus*) is a master of the aerial realm, a dark, streamlined bird built for life on the wing. Its general appearance is deceptively simple: a uniform, sooty-brown plumage that blends seamlessly into the twilight skies of its South American forest and mountain habitats. Unlike many swifts, it lacks a pale throat patch or rump band, giving it a particularly monolithic silhouette. Its unique characteristics lie in its extreme adaptations—tiny, weak feet that are nearly useless for perching, forcing it to cling to vertical surfaces like cliffs and waterfalls, and a wide, gaping mouth that acts as a flying insect net. A special feature is its breeding behavior; this species often nests directly behind thundering waterfalls, where its young must cling to damp rock faces, a testament to its incredible agility and resilience in the face of constant spray and mist.

Faits amusants

One of the most extreme behaviors of the Sooty Swift is its ability to enter a state of daily torpor, dropping its body temperature to conserve energy during cold Andean nights, making it practically cold-blooded for hours. It is a master of "aerial plankton" feeding, scooping up thousands of tiny flying insects in its gaping mouth while flying non-stop for entire days, and it often nests directly behind thundering waterfalls, where its chicks must cling to wet, mossy cliffs to avoid being washed away. Remarkably, these swifts have been recorded flying at altitudes over 6,000 meters (19,700 feet), higher than most other birds, allowing them to travel over mountain peaks that would block other species.

Habitats et répartition

The Sooty Swift inhabits humid montane and subtropical forests, often near cliffs, rocky outcrops, and waterfalls where it nests on vertical surfaces. It is also found in adjacent open areas, including forest edges, clearings, and sometimes over agricultural land or towns, typically at elevations between 500 and 2,500 meters. Its geographical range spans the eastern slopes of the Andes from northern Argentina and Bolivia through Peru, Ecuador, and Colombia, extending into the highlands of Venezuela, Guyana, and the tepuis of southern Venezuela and northern Brazil.

Comportements & Reproduction

The Sooty Swift is a highly social species, often foraging and roosting in large flocks, but during breeding they form loose colonies rather than dense aggregations. Mating appears to be monogamous for a given season, with pairs engaging in aerial courtship chases and mutual preening at the nest site. A unique reproductive strategy is their reliance on turbulent waterfalls and spray zones: they nest on vertical cliff faces behind or near cascading water, using moss and mud to construct a shallow cup that is constantly dampened. Both parents share incubation of a single egg, and the chick develops slowly, fledging after about 40 days. This delayed development is likely an adaptation to the cool, humid microclimate and the challenge of feeding on erratic swarms of flying insects.

Alimentation

The Sooty Swift is an aerial insectivore, meaning its diet consists exclusively of insects and other small arthropods captured in flight. It feeds almost entirely on flying ants, beetles, flies, bees, wasps, and moths, often foraging at high altitudes above forest canopies or along cliff faces. An interesting fact about its diet is that it is highly specialized to exploit seasonal swarms, particularly the massive emergences of winged ants and termites, which it consumes in large numbers to build fat reserves during breeding. Additionally, Sooty Swifts have been observed drinking by skimming their lower bill across the surface of water bodies while in flight, a behavior shared with other swifts but rare among most birds. They do not land to feed or drink, spending virtually their entire waking hours on the wing in pursuit of prey.

Couleurs

The Sooty Swift is almost entirely a uniform dark chocolate-brown, appearing nearly black at a distance, with slightly paler, sooty-brown underparts and a faintly paler throat. It lacks distinct markings, stripes, or bold patterns, and its unrelieved, dusky coloration serves as excellent camouflage against dark cliff faces and stormy skies, blending seamlessly into its high-altitude aerial habitat.

Distribution Map

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

Détails de l'attraction

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