• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Justification of Red List category
The species's extent of occurrence (calculated using a Minimum Convex Polygon) is very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (extent of occurrence <20,000 km² combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). Therefore, the species is now listed as Least Concern.

Population justification
The global population size has not been quantified, but the species is described as possibly not uncommon (Cleere 1998).

Trend justification
The population is suspected to be in decline owing to ongoing habitat destruction.

Nyctiprogne vielliardi was only described in 1994, and is currently known from just two localities on the rio São Francisco in Bahia and Minas Gerais, central Brazil (Lencioni-Neto 1994, Cleere and Nurney 1998). It is presumably more widely distributed along the rio São Francisco and immediately adjacent tributaries (of which there are few in the caatinga zone) (J. Mazar Barnett verbally 2000). There is no information on population but, at least in Minas Gerais, it may not be uncommon (Cleere and Nurney 1998, J. Mazar Barnett verbally 2000).

It is crepuscular and presumably nocturnal along riverbanks in caatinga woodland, having been observed feeding high above the open river in loose flocks of up to 20 birds at dusk (J. Mazar Barnett verbally 2000). Roosting birds have been flushed from riverside bushes and the ground (Lencioni-Neto 1994, Cleere and Nurney 1998).

No specific threats are known, but it must be threatened to some extent by the loss of riverine forest and scrub within its range.

Conservation Actions Underway
None is known.

Conservation Actions Proposed
Study its ecological requirements. Search for the species along potentially suitable stretches of river. Clarify threats. Protect significant areas of riverine forest within its range.

Text account compilers
Sharpe, C.J., Westrip, J., Benstead, P., Williams, R., Symes, A.

Contributors
Mazar Barnett, J.

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Recommended citation
BirdLife International (2024) Species factsheet: Bahian Nighthawk Nyctiprogne vielliardi. Downloaded from https://datazone.birdlife.org/species/factsheet/bahian-nighthawk-nyctiprogne-vielliardi on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.