• 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.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	C2a(i)

Red List history

Year	Category	Criteria
2021	Vulnerable	C2a(i)
2016	Endangered	B1ab(ii,iii,iv,v);C2a(i)
2012	Endangered	B1ab(ii,iii,iv,v);C2a(i)
2008	Endangered	B1a+b(ii,iii,iv,v); C2a(i)
2004	Endangered
2000	Endangered
1996	Critically Endangered
1994	Critically Endangered
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	102,000 km2	medium

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	estimated	2021
Population trend	decreasing	poor	inferred	2020-2030
Rate of change over the past 10 years/3 generations (longer of the two periods)	4-14%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	5-17%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	5-17%	-	-	-
Generation length	2.42 years	-	-	-
Number of subpopulations	4-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The species is locally common (CEMAVE 2018), but there are few recent records from Espírito Santo or Minas Gerais (2018). Based on the minimum and median recorded densities of the congener Glaucis hirsutus (2 and 3.3 individuals per km², respectively), the area of tree cover with at least 50% canopy cover within the species's range in 2010 (28,600 km²; Global Forest Watch 2021), and assuming that between 5 and 25% of the tree cover is occupied by the species (based on the species having a localised distribution), the population size is suspected to fall within the range of 2,800 - 24,000 individuals, roughly equating to 1,900 - 16,000 mature individuals. The species appears to require well-preserved forest (Silveria 2008), of which little remains in southern Bahia (B. Phalan in litt. 2021). Furthermore, G. hirsutus is a much commoner species than G. dohrnii, so the population density of the latter species may be expected to be lower. The true population size may therefore be expected to fall towards the lower end of the band, and is estimated to be smaller than 10,000 mature individuals.

The species's remaining habitat is fragmented and there are no records of individuals moving between sites, so there are assumed to be multiple subpopulations, with fewer than 1,000 individuals in the largest subpopulation (CEMAVE 2018).

Trend justification:

Local extinctions have occurred, including at localities formerly thought to be strongholds of the species, such as the Córrego Grande Biological Reserve (Hinkelmann 1999). Remote sensing data on tree cover loss within the species's range indicates that approximately 9% of tree cover with at least 50% canopy cover was lost over ten years from 2009-2019 (Global Forest Watch 2021). Extrapolating forward, it is estimated that up to 12% may be lost over the next decade, assuming that the rate of forest loss remains constant. The species is generally found in primary forest and so its population is inferred to be undergoing an ongoing continuing decline as a result of this habitat loss, at a rate of 4-14% over the past ten years, and 5-17% over the next ten years.

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

Country/Territory	IBA Name
Brazil	Alto Cariri
Brazil	Boa Nova / Serra da Ouricana
Brazil	Estação Veracruz
Brazil	Parque Nacional do Pau Brasil / Trancoso
Brazil	Serra Bonita
Brazil	Serra de Itamaraju
Brazil	Serras das Lontras e do Javi

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 500 m	Occasional altitudinal limits	(max) 600 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		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Natural system modifications	Fire & fire suppression - Trend Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Transportation & service corridors	Roads & railroads	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Hook-billed Hermit Glaucis dohrnii. Downloaded from https://datazone.birdlife.org/species/factsheet/hook-billed-hermit-glaucis-dohrnii on 23/12/2024.
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 23/12/2024.