Long-trained Nightjar

Characterized by an extraordinary morphological specialization, this member of the Caprimulgidae family is one of the most striking and enigmatic nightjars of the Neotropical region. This nocturnal and crepuscular bird is widely recognized for its masterfully cryptic plumage and the astonishing physical development of the male during the breeding season, which allows it to blend seamlessly into the dense understory of its native forest ecosystems.

It exhibits an extreme degree of sexual dimorphism primarily expressed in the structure and length of the rectrices. Adult males possess extraordinarily elongated outer tail feathers that can measure between 50 and 68 centimeters in length, which is several times the actual length of their body; these spectacular feathers are dark gray with lighter transverse bars and prominent white tips. In contrast, females present a much shorter, normally proportioned, and rounded tail without any ornamental elongations. The overall plumage of both sexes is highly cryptic, composed of an intricate mosaic of brown, black, gray, and buff tones that perfectly mimic dead leaves, bark, and lichen. A subtle cinnamon-colored nuchal collar adorns the hindneck, and a small white patch is present on the throat. The bill is short but features an extremely wide gape, surrounded by stiff, well-developed rictal bristles that act as a funnel to capture insects mid-air.

Geographical distribution: This species is endemic to the eastern portion of South America, closely associated with the Atlantic Forest biome. Its primary range extends throughout eastern and southeastern Brazil, from the states of Bahia and Minas Gerais south to Rio Grande do Sul. It is also found in eastern Paraguay and in the northeastern corner of Argentina, specifically within the province of Misiones, which represents the southwesternmost limit of its geographic range.

Habitat: It primarily inhabits the interior and edges of humid subtropical and tropical forests, as well as secondary growth forests and montane woodlands, ranging from sea level up to 1800 meters in altitude. It shows a strong preference for steep forested slopes, natural gaps within primary forests created by fallen trees, dense shrubby clearings, and transitional zones where the dense canopy opens up, providing suitable clearing spaces for its aerial foraging maneuvers.

Feeding: Its diet is exclusively insectivorous, focusing on the active capture of nocturnal and crepuscular flying insects. It utilizes a sit-and-wait hunting strategy, commonly known as "sallying," where it perches silently on low branches, fallen logs, or rocks, and then darts suddenly into the air to intercept passing prey. Its main food sources include lepidopterans (moths), coleopterans (beetles), orthopterans, and other flying invertebrates, which are swallowed whole thanks to its expansive oral cavity.

Behavior: During the daytime, it remains completely inactive, roosting directly on the ground among dry leaf litter or on low-lying mossy branches. It relies entirely on its exceptional camouflage to avoid detection, remaining motionless until an intruder is only a few inches away before taking off in a silent, erratic flight. At dusk, it becomes highly active, and males perform elaborate aerial courtship displays, undulating and spreading their extremely long tail feathers to attract females. Its vocalization is characterized by a series of thin, high-pitched, whistled notes, often repeated from hidden perches within the understory.

Nesting: It does not construct any physical nest structure. The female lays a clutch of one or two eggs directly on the bare ground, specifically on the accumulation of dry leaves in highly shaded forest areas, often under the protection of ferns, low shrubs, or fallen debris. The eggs are cream-colored, heavily speckled and marbled with reddish-brown and gray spots to blend with the substrate. Both parents contribute to incubation and chick rearing, with the female performing the vast majority of daytime incubation, rely-ing on her perfect mimetism to protect the clutch from visual predators.

Conservation status: It is currently classified as Least Concern (LC) on the IUCN Red List of Threatened Species. Although its population is currently suspected to be in decline due to the rapid rate of deforestation, urbanization, and agricultural expansion within the Atlantic Forest biome, the species is still considered relatively common in protected areas and exhibits a moderate degree of tolerance to secondary forest patches, provided that sufficient understory cover remains intact.