Thalurania watertonii 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Caprimulgiformes Trochilidae

Scientific Name: Thalurania watertonii (Bourcier, 1847)
Common Name(s):
English Long-tailed Woodnymph
Taxonomic Source(s): SACC. 2005 and updates. A classification of the bird species of South America. Available at: #
Identification information: Male c. 13 cm and female c. 10 cm. Medium-sized straight bill. Male has green crown and lower neck, iridescent violet-blue black, grass green underparts and violet-blue flanks and a long, deeply forked tail. Female has golden green crown and hindneck, bluish-green lower back and uniformly greyish-white underparts, tail not elongated but slightly forked (Schuchmann et al. 2015). Voice Suspected to make loud "chipping" calls at varying speeds and often for long periods (Schuchmann et al. 2015).

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(ii,iii,v); C2a(i) ver 3.1
Year Published: 2017
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Gussoni, C.
Facilitator/Compiler(s): Benstead, P., Harding, M., Sharpe, C J, Symes, A., Williams, R. & Ashpole, J
This species has been uplisted to Endangered. It has a small population (<2,500 individuals) and a moderately small and severely fragmented range, with each subpopulation holding less than 250 individuals (ICMBio 2014). The population is suspected to be declining owing to habitat loss (del Hoyo et al. 1999).

Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is confined to Pernambuco, Alagoas and Sergipe, Brazil (ICMBio 2014). It apparently occurs in northern Bahia (Schuchmann et al. 2015), although there are no recent records (WikiAves 2015). Reports from eastern Pará are probably erroneous, and it is known from just one type specimen in Guyana, although the true origin of the specimen is uncertain (Schuchmann et al. 2015). It is common but presumably declining due to habitat loss. The species's relative abundance is low in RPPN Pedra D'Anta and RPPN Frei Caneca (C.O.A. Gussoni in litt. 2015).

Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:499Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:39800
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):700
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The global population is estimated at less than 2,500 individuals, with no more than 250 individuals in each subpopulation (ICMBio 2014).

Trend Justification:  The population is suspected to be declining owing to widespread deforestation which is thought to be severe in some areas, although it is noted that the species will accept altered habitats as long as forest patches or stands of trees remain.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:1000-2499Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:Yes
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:It is restricted to lowland habitats such as coastal rainforest, cerrado, plantations and parks throughout its Atlantic forest range. It forages in the understorey and middle strata, usually on the periphery of vegetation on nectar and occasional invertebrates. Males defend territories against conspecific intruders and other hummingbirds. Breeding occurs between November and February.

Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):4.2
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Widespread and continuing disappearance of lowland forest in north-eastern Brazil is likely to be causing declines, the Atlantic forests north of the Sao Francisco river having been drastically reduced, with less than 4% remaining by 1995. It seems able to accept man-made habitats as long as patches of forest or stands of scattered trees remain.

Conservation Actions [top]

Conservation Actions: Conservation and Research Actions Underway
CITES Appendix II. Listed as Endangered on the 2014 Brazilian Red List (ICMBio 2014). It occurs in Monte Pascoal National Park and Pedra Talhada State Park. It is also found in RPPN Pedra D'Anta and RPPN Frei Caneca (C.O.A. Gussoni in litt. 2015).

Conservation and Research Actions Proposed

Effectively protect and manage protected areas where the species occurs. Study its ecology and its ability to persist in degraded and fragmented habitats. Attempt to obtain an accurate estimate of its population size and trends.

Amended [top]

Amended reason: Edited Geographic Range Information text, and removed a reference.

Citation: BirdLife International. 2017. Thalurania watertonii (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22687402A119410693. . Downloaded on 21 May 2018.
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