Introduction
The Spot-tailed Nightjar (Hydropsalis maculicaudus) is a medium-sized nightjar of tropical and subtropical Central and South America. It is an elusive, ground-roosting bird that is most often detected by its calls or brief, low flights at dusk and during the night. Its cryptic plumage and pale spotting on the tail and wings help explain both its common name and its ability to remain concealed by day. (itis.gov)
Physical Description
The Spot-tailed Nightjar is approximately 20–23 cm long. Its plumage is predominantly brown, greyish-brown and buff, with fine mottling that provides effective camouflage among leaf litter, bare ground, grass and low vegetation. A narrow rufous-buff collar is usually visible around the sides and rear of the neck, while the crown, back and wing coverts are marked with pale buff or whitish spots.
The tail has pale spotting that is particularly noticeable during flight. Males generally show more conspicuous white markings on the outer tail feathers and a pale terminal band. Females are usually duller, with more restricted tail markings and stronger barring. Juvenile plumage is less well documented, but young birds are expected to be more heavily barred and subdued than adults. (peruaves.org)
Range and Habitat
The species has a patchy distribution from south-eastern Mexico through parts of Central America and into northern and eastern South America. Its range extends southwards to eastern Bolivia, eastern Paraguay and south-eastern Brazil. Records are local and often widely separated, so the species may be overlooked in suitable habitat.
The Spot-tailed Nightjar is associated mainly with open or semi-open landscapes, including dry savanna, seasonally wet or flooded lowland grassland, marsh edges, riverside scrub, forest edges and other areas with sparse vegetation. It may occur from lowlands to foothill habitats, with regional records reaching higher elevations in the Andes and south-eastern Brazil. (aviansystematics.org)
Movement patterns vary geographically. Southern South American populations are generally considered sedentary, while some Central American populations may undertake seasonal movements. The available evidence is limited, and the species should not be described as uniformly migratory or uniformly resident across its entire range. (en.wikipedia.org)
Behaviour and Diet
The Spot-tailed Nightjar is crepuscular and nocturnal. It typically rests on the ground during daylight, where its mottled plumage makes it difficult to detect. Activity increases around dusk, during the night and again before dawn.
It feeds on flying insects, which it catches during low, slow sallies from the ground or from a low perch. Its diet includes insects from several orders and families. The broad mouth and light, buoyant flight typical of nightjars are well suited to this form of aerial feeding.
Breeding behaviour remains incompletely known. The female lays two eggs, occasionally one, directly on the ground without constructing a conventional nest. The eggs are placed in a shallow depression or on suitably camouflaged ground. Breeding seasons vary between regions, and detailed information on incubation, parental care and chick development is still limited. (en.wikipedia.org)
Identification Tips
- Look for a medium-sized, cryptically patterned nightjar in open grassland, savanna, marsh margins or scrubby clearings.
- At rest, note the buff and whitish spotting on the wing coverts, the narrow rufous-buff collar and the generally mottled brown upperparts.
- In flight, the pale spots and pale terminal markings on the tail are important clues, especially in males.
- The species often flies low and quietly at dusk, rather than making long, high flights.
- Do not rely on plumage alone. The Spot-tailed Nightjar can resemble other small brown nightjars, so location, habitat, flight pattern and vocalisations should be considered together.
- The species is frequently easier to detect by its distinctive calls than by sight.
Conservation Status
The Spot-tailed Nightjar is currently assessed as Least Concern on the IUCN Red List. Its broad geographic range means that it is not considered globally threatened at present, although reliable information on population size and long-term trends is limited. No global population estimate is given here.
Local populations may be affected by the conversion or degradation of savannas, grasslands, marsh edges, scrub and other open habitats through agricultural expansion, intensive grazing, drainage, burning regimes, infrastructure and urban development. Maintaining structurally diverse open habitats and protecting seasonally wet breeding areas are appropriate conservation measures. (device.report)
Frequently Asked Questions
Where does the Spot-tailed Nightjar live?
It occurs patchily from south-eastern Mexico through Central America and into northern and eastern South America, with its southern range reaching eastern Bolivia, eastern Paraguay and south-eastern Brazil.
What habitat does the Spot-tailed Nightjar prefer?
It is mainly associated with open and semi-open habitats such as savanna, seasonally wet or flooded grassland, marsh margins, riverside scrub and forest edges.
Is the Spot-tailed Nightjar migratory?
Movement varies by region. Southern populations are generally considered sedentary, while some Central American populations may make seasonal movements.
What does the Spot-tailed Nightjar eat?
Its diet consists of flying insects, which it usually captures during low, slow flights from the ground or a low perch.
Where does it build its nest?
It does not build a conventional nest. The female normally lays one or two eggs directly on the ground, often in a naturally sheltered or camouflaged position.
How can the species be identified in the field?
Key features include cryptic brown-and-buff plumage, a narrow buff or rufous collar, pale spotting on the wing coverts and conspicuous pale tail markings in flight. Its calls may be easier to detect than the bird itself.
References
- American Ornithologists’ Union. 2024. Hydropsalis maculicaudus, Spot-tailed Nightjar, AOU Checklist of North and Middle American Birds. American Ornithological Society. Available at: https://checklist.americanornithology.org/taxa/728 (accessed 8 September 2026).
- BirdLife International. 2024. Handbook of the Birds of the World and BirdLife International Digital Checklist of the Birds of the World, version 9. BirdLife International and Lynx Edicions. Available at: https://datazone.birdlife.org/ (accessed 8 September 2026).
- Billerman, S. M., Keeney, B. K., Rodewald, P. G. and Schulenberg, T. S., eds. 2022. Birds of the World. Cornell Laboratory of Ornithology. Species information for the Spot-tailed Nightjar, Hydropsalis maculicaudus. Available at: https://birdsoftheworld.org/bow/home (accessed 8 September 2026).
- Gill, F., Donsker, D. and Rasmussen, P., eds. 2026. IOC World Bird List, version 15.2. International Ornithologists’ Union. Available at: https://www.worldbirdnames.org/ (accessed 8 September 2026).
- International Union for Conservation of Nature. n.d. IUCN Red List of Threatened Species. Species assessment information for the Spot-tailed Nightjar, Hydropsalis maculicaudus. Available at: https://www.iucnredlist.org/ (accessed 8 September 2026).
- Lawrence, G. N. 1862. Descriptions of six new species of birds, of the families Charadriidae, Trochilidae, and Caprimulgidae. Annals of the Lyceum of Natural History of New York 7: 455–460.
- Schulenberg, T. S., Stotz, D. F. and Rico, L. 2006. Distribution Maps of the Birds of Peru, version 1.0. Environment, Culture and Conservation, The Field Museum. Available at: http://fm2.fieldmuseum.org/uw_test/birdsofperu (accessed 8 September 2026).
- Trust for Avian Systematics. n.d. Handbook of the Birds of the World, fourth edition, checklist by family: Caprimulgidae. Available at: https://www.aviansystematics.org/checklist?viewfamilies=76 (accessed 8 September 2026).
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