Silky-tailed Nightjar

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Quick Facts

Nocturnal
  • Scientific Name: Antrostomus sericocaudatus
  • Spanish Name: Guardacaminos colisedoso
  • Family: Caprimulgidae
  • Known Nicknames: Silky-tailed whip-poor-will
  • Average Length: 24–30 cm / 9.4–11.8 in
  • Average Weight: 53–83 g / 1.9–2.9 oz
  • Wingspan: N/A
  • Key Feature: Broad, silky-white or buff-colored tips on the outer tail feathers and highly cryptic, mottled dark-brown plumage
  • Primary Diet: Insectivore
  • Range: Disjunct ranges in South America, including the Amazon Basin (Peru, Bolivia) and the Atlantic Forest (southeastern Brazil, eastern Paraguay, and northeastern Argentina)
  • Habitat: Humid lowland and montane forests, forest edges, and transitional woodland
  • Social Structure: Solitary
  • Nesting/Breeding: Directly on the leaf litter of the forest floor
  • Conservation Status: Least Concern (LC)
  • Population Trend: Decreasing

The Silky-tailed Nightjar (*Antrostomus sericocaudatus*) is an elusive, nocturnal master of disguise native to the humid forests of South America. This medium-sized bird features a highly cryptic plumage of mottled browns, greys, and buffs, allowing it to blend seamlessly into leaf litter and tree bark to evade predators during the day. Its most defining characteristic, which inspires its name, is the male's striking tail adorned with broad, silky-white outer tips that shimmer brilliantly during moonlit courtship displays. Perfectly adapted for nighttime hunting, the nightjar possesses remarkably large eyes for low-light vision, a wide mouth fringed with sensitive, hair-like rictal bristles to scoop up insects mid-air, and a silent, ghostly flight pattern complemented by a distinct, melancholic whistled call that echoes through the forest canopy.

Fun Facts

Boasting a deceptively massive mouth fringed with stiff, hair-like "rictal bristles" that act like a biological net, this bird scoops up insects mid-flight with acrobatic ease. To navigate the dark, its eyes feature a specialized reflective layer that glows a haunting, brilliant orange-red under a flashlight. During courtship, males show off by flashing the bright, silky-white outer tail feathers that give the species its name. When daytime arrives, they forego nest-building entirely, laying their eggs directly on the forest floor where their mind-boggling camouflage allows them to melt invisibly into the dead leaf litter.

Habitats & Distribution

This species exhibits a disjunct distribution across South America, separated into two distinct geographical populations. The northern population is found in the Amazon Basin, spanning parts of northern Bolivia, eastern Peru, and northern Brazil. The southern population occupies the Atlantic Forest region, stretching across southeastern Brazil, eastern Paraguay, and far northeastern Argentina. Within these ranges, it primarily inhabits humid tropical and subtropical lowland forests, showing a strong preference for mature evergreen forests, dense secondary growth, and forest edges. It is frequently associated with areas containing thick undergrowth or bamboo stands, typically occurring at elevations below 1,000 meters, where it utilizes the dense vegetation for daytime roosting.

Behaviours & Reproduction

This species is primarily nocturnal and solitary, spending its days roosting cryptically on the forest floor or low branches where its patterned plumage provides excellent camouflage. During the night, it becomes active, foraging for insects by sallying from perches. Socially, it maintains a solitary lifestyle outside of the breeding season, but males become highly vocal and territorial during mating periods, using a distinctive, liquid, warbling whistle to define their territory and attract mates. Reproduction is characterized by monogamous pairings and a minimalist nesting strategy. Instead of building a nest, the female lays a clutch of usually two cryptically colored eggs directly onto the leaf litter of the forest floor, relying entirely on camouflage for protection. Both parents share incubation and brooding duties, blending seamlessly into the surroundings to avoid detection. If a predator approaches, the adults may employ distraction displays, feigning injury to lure the threat away from the highly vulnerable nest site.

Diet

The Silky-tailed Nightjar (*Antrostomus sericocaudatus*) is a nocturnal insectivore whose diet consists almost exclusively of flying insects, with a strong preference for large beetles and moths. Unlike some nightjars that forage continuously on the wing, this species employs a "sit-and-wait" hunting strategy, perching quietly in the forest canopy or subcanopy and sallying outward in short, agile flights to snatch passing prey from the air. To facilitate this nocturnal feeding, it possesses an exceptionally wide gape fringed with specialized, sensitive rictal bristles that help funnel insects directly into its mouth during mid-air strikes. Additionally, its feeding patterns are highly synchronized with lunar cycles, as the bird relies on the silhouettes of insects illuminated against the moonlit sky to hunt, making bright nights its most active and successful foraging periods.

Colors

The Silky-tailed Nightjar features highly cryptic, bark-like plumage dominated by rich rufous-brown and blackish tones, intricately patterned with buff spots and fine vermiculations for seamless camouflage against forest leaf litter. It is distinguished by a prominent buffy-rufous collar on the hindneck and conspicuous, silky-white patches on the tips of its outer tail feathers.

Distribution Map

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