Scissor-tailed Nightjar

Belonging to the family Caprimulgidae, this medium-sized crepuscular bird is distinguished by its astonishing sexual dimorphism and highly cryptic plumage. Adult males possess extraordinarily long, deeply forked outer tail feathers (rectrices) that can reach lengths between 11 and 15 inches (28 to 38 centimeters), more than doubling the bird´s actual body length, which measures about 8 inches (20 centimeters). Females, conversely, lack these elongated caudal ornaments, displaying a much shorter, rounded tail. Their overall plumage is an intricate mosaic of grayish, brownish, black, and buff tones, evolutionary designed to merge seamlessly with the leaf litter of the forest floor. Diagnostic features include a prominent rufous or cinnamon collar on the hindneck, pale wing bars visible in flight, and a short, wide bill flanked by stiff rictal bristles that aid in prey capture.

Geographical distribution: It is widely distributed across eastern and central South America. Its range encompasses a vast geographical area, including eastern and southern Brazil, central and eastern Bolivia, the entirety of Paraguay, northern and central Argentina (reaching down to the Pampas region), and localized portions of western Uruguay. It is predominantly a resident species throughout most of its territory, though southern populations may exhibit seasonal, short-distance migrations or local movements during the austral winter months.

Habitat: This caprimulgid primarily occupies open and semi-open ecosystems. It is a highly adaptable species, successfully colonizing the Cerrado, shrubby savannas, dry forest edges, Chaco woodlands, degraded pastures with scattered trees, and agricultural margins. It displays a strong preference for terrains characterized by a mosaic of bare ground, sandy patches, and low herbaceous vegetation, which offer optimal conditions for both daytime roosting and nocturnal hunting. It strictly avoids deep, continuous humid forests, preferring the ecotones between woody and grassy biomes.

Feeding: Its diet is exclusively insectivorous, consisting of a diverse array of nocturnal arthropods. Common prey items include beetles, moths, crickets, and winged termites. Hunting activities are restricted to twilight and nocturnal hours, coinciding with peak insect activity. It employs an aerial sallying technique, resting on the ground or low perches and launching swift, acrobatic flights to snap up flying insects mid-air. Its wide gape, combined with excellent night vision enhanced by the moonlight, makes it a highly efficient aerial predator.

Behavior: This species is strictly crepuscular and nocturnal in its daily cycle. During the day, it roosts directly on the ground, relying entirely on its disruptive coloration to remain invisible to potential predators; it will typically freeze, flushing only at the very last moment in a silent, erratic flight pattern. After dusk, it becomes active, frequently perching on dirt roads, fence posts, or low branches. During the breeding season, males perform spectacular courtship displays, fluttering and opening their exaggerated, scissor-like tails in aerial maneuvers while emitting soft, repetitive calls to attract females.

Nesting: It does not construct any physical nest structure. The female deposits her clutch directly onto a shallow depression on bare ground or leaf litter, choosing spots that offer optimal visual concealment. The clutch typically consists of two elliptical eggs, heavily blotched with brown, cream, and gray markings that perfectly mimic surrounding gravel or soil. Both parents participate in the incubation process, with the female taking the daytime shift. The chicks are semi-altricial, hatching covered in a cryptic, downy plumage that allows them to blend into the ground and remain completely motionless while being provisioned by the parents.

Conservation status: It is currently evaluated as Least Concern (LC) on the IUCN Red List of Threatened Species. Given its extremely large geographic range, stable population trends, and high tolerance for anthropogenically modified or fragmented landscapes, the species does not face any immediate threats of extinction. Nonetheless, local populations can be negatively impacted by intensive agricultural expansion, habitat destruction, and the excessive use of chemical pesticides, which dramatically reduces the availability of their insect prey.