• 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)	C2a(i)

Red List history

Year	Category	Criteria
2023	Endangered	C2a(i)
2016	Endangered	B2ab(ii,iii,v); C2a(i)
2015	Endangered	B2ab(ii,iii,v); C2a(i)
2012	Near Threatened	B1ab(i,ii,iii,iv,v)
2008	Near Threatened	B1a+b(i,ii,iii,iv,v)
2004	Near Threatened
2000	Lower Risk/Least Concern
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	29,000 km2	medium
Area of Occupancy (breeding/resident)	24,800 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1000-2499 mature individuals	medium	estimated	2018
Population trend	decreasing	-	inferred	2017-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Generation length	2.35 years	-	-	-
Number of subpopulations	10-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The species is considered common, but apparently occurring at a low density (C.O.A. Gussoni in litt. 2015, Schuchmann et al. 2020). Based on extensive surveys and observational records within its small range, the number of mature individuals is estimated at less than 2,500, with less than 250 mature individuals in each subpopulation (ICMBio 2018).

Trend justification: Even though the species is also found in altered habitats as long as forest patches remain, it is more common in humid, dense rainforest (ICMBio 2018, Schuchmann et al. 2020). Ongoing tree cover loss within the range (currently at a rate of 4% over ten years; Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein) is therefore causing a slow population decline, which is here placed in the band 1-9% over ten years.

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

Country/Territory	IBA Name
Brazil	Brejo dos Cavalos
Brazil	Engenho Coimbra (Usina Serra Grande)
Brazil	Guadalupe
Brazil	Mata do Estado (Mata do Sirigi)
Brazil	Murici
Brazil	Parque Nacional de Monte Pascoal
Brazil	Usina Cachoeira

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Plantations	suitable	resident
Artificial/Terrestrial	Urban Areas	marginal	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Savanna	Dry	major	resident
Altitude	0 - 700 m	Occasional altitudinal limits

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	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
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Transportation & service corridors	Roads & railroads	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Long-tailed Woodnymph Thalurania watertonii. Downloaded from https://datazone.birdlife.org/species/factsheet/long-tailed-woodnymph-thalurania-watertonii on 23/11/2024.
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 23/11/2024.