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

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Least Concern
2016	Vulnerable	C2a(i)
2012	Vulnerable	C2a(i)
2008	Vulnerable	C2a(i)
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Threatened

Migratory status	not a migrant	Forest dependency	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	150,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	medium	suspected	2016-2031
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-5%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-5%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-5%	-	-	-
Generation length	4.9 years	-	-	-
Number of subpopulations	1-30	-	-	-

Population justification: There are no empirical data available from which to estimate this species' population size and even qualitative estimations of its abundance are obfuscated by its remote distribution and by virtue of it being an infrequently observed, nocturnal species for which, until relatively recently, the vocalisations were not known (Yong et al. 2012). Even so, it is described as 'uncommon' in Eaton et al. (2021) and is evidently not an abundant species, although may be regularly observed at known, accessible sites (eBird 2023). Although a population size is not estimated herein, there is more than 100,000 km² of forest in its mapped range, such that even if a small percentage of this is occupied, the population size is unlikely to be small. With no known acting threats on the species, there is no evidence that the contemporary population size is significantly depleted from a historic baseline.

Trend justification: The only threat known to be acting on this species is habitat loss and degradation. In the past three generations (15 years: 2007-2022), forest cover has reduced by only 2-3% in this species' range, and some of these losses are attributable to natural phenomena including landslides (Global Forest Watch 2023, based on data from Hansen et al. [2013] and methods disclosed therein). This species appears dependent on primary forest, even if it strays over clearings and tracks when foraging (Yong et al. 2012, Eaton et al. 2021), and these minor losses are suspected of causing a very slow, ongoing decline. Nonetheless, these declines are unlikely to be occurring at a rate that exceeds 5% over three generations. The range of E. diabolicus is mostly contained to forest that is considered the least susceptible to exploitation in the future (see Voigt et al. 2021), and declines are therefore unlikely to accelerate in the future.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Indonesia	extant	native	yes

Country/Territory	IBA Name
Indonesia	Buton Utara
Indonesia	Feruhumpenai - Matano
Indonesia	Gunung Klabat
Indonesia	Lore Lindu
Indonesia	Morowali
Indonesia	Tangkoko Dua Sudara

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	marginal	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1000 - 2500 m	Occasional altitudinal limits	(min) 250 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Agro-industry farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Annual & perennial non-timber crops - Shifting agriculture	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Heinrich's Nightjar Eurostopodus diabolicus. Downloaded from https://datazone.birdlife.org/species/factsheet/heinrichs-nightjar-eurostopodus-diabolicus 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.