Bonaparte's Nightjar

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Image:BonapartesNightjar.jpg

Common Name: Bonaparte's Nightjar
Scientific Name: Caprimulgus concretus

Size: 8.2-8.6 inches (21-22 cm); Wingspan: 22-23.6 inches (56-60 cm)

Habitat: Asia; occurs on Sumatra, Belitung Island and Kalimantan (Borneo), Indonesia, Brunei, and Sabah and Sarawak (Borneo), Malaysia, where it is locally common, but rarely recorded.

It is restricted to lower elevations (usually below 500 m) where it frequents forest, perhaps particularly clearings and edges, heath forest and secondary growth. The true nature of its habitat use is uncertain, although it has been observed foraging from a perch inside forest.

Status: Vulnerable. Global population: 15,000-30,000 adult individuals with a decreasing population trend. If this bird is an extreme lowland forest specialist, as appears possible, then it must be in steep decline from habitat loss. Rates of forest loss in the Sundaic lowlands have been extremely rapid (Kalimantan lost nearly 25% of its evergreen forest during 1985-1997, and Sumatra lost almost 30% of its 1985 cover), because of a variety of factors, including the escalation of logging and land conversion, with deliberate targeting of all remaining stands of valuable timber including those inside protected areas. Furthermore, the major fires of 1997-1998 affected about.50,000 km2 of forest on Sumatra and Borneo, damaged at least 17 of Indonesia's parks and reserves and, following previous major conflagrations in 1972 and 1982-1983, accelerated the desiccation of the forest environment that renders regrowth and unburnt adjacent areas more vulnerable to fire and poorer in biodiversity.

Diet: Nocturnal insects. Forages by making short flycatching sallies from perches, often hunting out over rivers.

Nesting: Sexes are dimorphic. The upper parts are brown spotted with chestnut. There is no nuchal collar markings. The wing-coverts are brown, spotted with chestnut and cinnamon. The scapulars are blackish-brown tipped with chestnut, and have broadly edged pale buff on the outer web edges. The submoustachial stripe is white and it has a large white throat patch. The under parts are brown barred with chestnut, and becoming buff barred brown on the belly and flanks. Both sexes lack white on wings; the male has white tips to two outermost tail feathers and the female lacks them or rarely has very narrow white tips. The irises are dark brown, the bills are brownish, and the legs and feet brown. Immature plumages are unknown.

Breeding habitats are unknown but nightjars nesting habits are similar. The scrape-type nest is created at the base of a tree or a shrub and 1-2 eggs are laid directly on the ground or on a leaf litter. Females usually incubate the eggs during the day with the male taking over at night.

Cool Facts: It is also known as the Sunda nightjar. The song of the male is a low, mournful “wa-ouuuu”, with the second note descending in pitch. It sings from perches, mainly at dusk and dawn and on moonlit nights.


Found in Songbird ReMix Frogmouths, Nightjars & Goatsuckers

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