Anas nesiotis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Anseriformes Anatidae

Scientific Name: Anas nesiotis (Fleming, 1935)
Common Name(s):
English Campbell Teal
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.
Identification information: 48 cm. Small, flightless, dark brown duck. Brown eclipse male, female and juvenile. Mottled dark brown breast. Prominent white eye-patch. Breeding male has glossy green head. Very narrow white collar, flank patch. Voice Soft, high-pitched wheezy whistles and popping (male), low quacks and growls (female).

Assessment Information [top]

Red List Category & Criteria: Endangered D ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Gummer, H., McClelland, P. & Williams, M.
Facilitator/Compiler(s): Benstead, P., Bird, J., Butchart, S., McClellan, R., Pilgrim, J., Symes, A., Taylor, J.
This species is listed as Endangered because it has an extremely small population, which is nevertheless increasing thanks to successful conservation efforts. The species remains susceptible to external threats, and any evidence of a renewed decline is likely to make the species eligible for uplisting.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Anas nesiotis is endemic to New Zealand, where it had been confined to Dent Island, an offshore islet of Campbell Island, for many decades. It was first collected in 1886 from the sea near Campbell (just 3 km away from Dent and likely to have been a stronghold for the species), but was not discovered on Dent until 1975. In 1990, a survey of Dent estimated a population of 60-100 birds (Goudswaard 1991), and it is likely that no more than 25 breeding pairs were present in 1998 (Gummer and Williams 1999). In 1999 and 2000, 24 captive-bred birds were released on Codfish Island to create a temporary population, and egg-laying occurred in their first year (Gummer and Williams 1999, Gummer 2006b). Following the successful eradication of brown rat Rattus norvegicus from Campbell Island in 2001, birds were taken back from Codfish Island for release in 2004 (50), 2005 (55) and 2006 (54) (Potter 2006, P. J. McClelland in litt. 2012, The majority of birds released in 2004 were believed to have survived their first year on Campbell Island, and successful breeding was confirmed in 2006 when a brood of ducklings were seen in January, followed by sightings of a duckling, three juveniles and two nests containing eggs in February 2006 (Anon 2006). A survey in December 2008 confirmed that the species has established on the island (P. J. McClelland in litt. 2008, 2010, 2011), and the total population (captive and wild) has climbed to more than 200 individuals (Potter 2006). The 2008 survey, along with opportunistic observations of breeding and dispersal activity (P. J. McClelland in litt. 2008, 2010, 2011), suggests that the population now includes between 100 and 200 mature individuals. 

Countries occurrence:
New Zealand
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:180
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:3Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):200
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Following a captive-breeding, reintroduction and translocation programme, the species is now thought to have exceeded 50 mature individuals for at least five years. Based on the numbers released, surveys and opportunistic observations of breeding and dispersal activity (P. McClelland in litt. 2011), the population probably includes between 100 and 200 mature individuals, equivalent to 150-300 individuals in total.

Trend Justification:  The population has increased to over 200 individuals thanks to a captive-breeding programme and the successful release of birds on Whenua Hou and more recently mainland Campbell Island.

Current Population Trend:Increasing
Additional data:
Number of mature individuals:100-200Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:1Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:Yes
No. of individuals in largest subpopulation:100

Habitat and Ecology [top]

Habitat and Ecology:It lives under thick, chest-high tussock (there are no pools or running water on Dent). It has been sighted over most of the island, but is probably more common below 100 m, and in damp areas. It has not been observed feeding on the island, but in captivity it feeds on amphipods, weevils, earthworms, seaweed and other insects. Birds released onto Codfish Island have been observed feeding on invertebrates in piles of rotting seaweed along the shore and foraging offshore at night (Gummer and Williams 1999). In captivity, females sometimes lay two clutches of between one and four eggs (Preddey 1995). Reintroduced males on Campbell Island hold territories. Birds have dispersed into open upland areas, Dracophyllum forest, upstream habitats and coastal beaches (Gummer 2006a).

Systems:Terrestrial; Freshwater
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):6.6
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Brown rats Rattus norvegicus on Campbell (one of the densest field populations in the world) may have caused its disappearance from this island (Williams and Robertson 1996). The successful eradication of this invasive alien species in 2001 has allowed the reintroduction of teal from captive stock. However, accidental reintroduction of rats, severe weather events and the introduction of avian disease remain possible threats. Brown Skua Catharacta lonnbergi, Kelp Gull Larus dominicanus, and Northern Giant-petrel Macronectes halli are potential natural predators (P. J. McClelland in litt. 2008, 2010, 2011).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CITES Appendix I. In 1998, 35 individuals were held in captivity (M. Williams in litt. 1999), originating from seven males and three females caught in 1984 and 1990, but nearly all have now been released onto Codfish Island with only around 20 birds retained as an insurance population (P. J. McClelland in litt. 2008, 2010, 2011). R. norvegicus was successfully eradicated from Campbell Island by 2003 during the world's largest rat eradication programme (BBC 2003, Seddon and Maloney 2003, Gummer 2006b). Birds have been successfully reintroduced to Campbell from the temporary Codfish Island population (M. Williams in litt. 1999, Anon 2006, Gummer 2006a, 2006b, Potter 2006). A survey of Campbell Island was carried out in December 2008, confirming that the population had established itself (P. J. McClelland in litt. 2008, 2010, 2011). All released birds have been screened for disease, but have so far not shown any negative signs (P. J. McClelland in litt. 2008, 2010, 2011). A monitoring expedition to Campbell Island is intended for summer 2013 (P. McClelland in litt. 2012).

Conservation Actions Proposed
Continue to monitor population trends. Continue to track the fate of released birds. Maintain the wild population and develop the captive breeding population. Establish additional wild populations. Exclude R. norvegicus from Campbell. Monitor the health of birds in all sub-populations to ensure that they are not suffering from disease.


Classifications [top]

4. Grassland -> 4.3. Grassland - Subantarctic
suitability:Suitable season:resident major importance:Yes
2. Land/water management -> 2.2. Invasive/problematic species control
3. Species management -> 3.2. Species recovery
3. Species management -> 3.3. Species re-introduction -> 3.3.1. Reintroduction
3. Species management -> 3.3. Species re-introduction -> 3.3.2. Benign introduction
3. Species management -> 3.4. Ex-situ conservation -> 3.4.1. Captive breeding/artificial propagation

In-Place Research, Monitoring and Planning
  Action Recovery plan:Yes
  Systematic monitoring scheme:No
In-Place Land/Water Protection and Management
  Conservation sites identified:Yes, over part of range
  Occur in at least one PA:No
  Invasive species control or prevention:Yes
In-Place Species Management
  Successfully reintroduced or introduced beningly:Yes
  Subject to ex-situ conservation:Yes
In-Place Education
  Subject to recent education and awareness programmes:No
  Included in international legislation:No
  Subject to any international management/trade controls:Yes
11. Climate change & severe weather -> 11.4. Storms & flooding
♦ timing:Future ♦ scope:Whole (>90%) ♦ severity:No decline ⇒ Impact score:Low Impact: 4 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality

8. Invasive and other problematic species, genes & diseases -> 8.1. Invasive non-native/alien species/diseases -> 8.1.1. Unspecified species
♦ timing:Future ♦ scope:Whole (>90%) ♦ severity:No decline ⇒ Impact score:Low Impact: 4 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

8. Invasive and other problematic species, genes & diseases -> 8.1. Invasive non-native/alien species/diseases -> 8.1.2. Named species [ Rattus norvegicus ]
♦ timing:Future ♦ scope:Whole (>90%) ♦ severity:No decline ⇒ Impact score:Low Impact: 4 
→ Stresses
  • 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.7. Reduced reproductive success

1. Research -> 1.5. Threats
1. Research -> 1.6. Actions
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Anon. 2006. The first brood of Campbell Island Teal Anas nesiotis. World Birdwatch 28(3): 3.

BBC. 2003. NZ routs island rats. BBC News:

Collar, N.J. and Butchart, S.H.M. 2013. Conservation breeding and avian diversity: chances and challenges. International Zoo Yearbook 48(1): 7-28.

Daugherty, C. H.; Williams, M.; Hay, J. M. 1999. Genetic differentiation, taxonomy and conservation of Australasian teals Anas spp. Bird Conservation International 9: 29-42.

Goudswaard, R. 1991. The search for the Campbell Island flightless teal Anas aucklandica nesiotis. Wildfowl 42: 145-148.

Gummer, H. 2006. Flightless ducks return home. World Birdwatch 28: 13-16.

Gummer, H. 2006. Snow ducks of the subantarctic. Forest and Bird 319: 32-35.

Gummer, H.; Williams, M. 1999. Campbell Island Teal: conservation update. Wildfowl 50: 133-138.

IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-3. Available at: (Accessed: 07 December 2016).

Potter, J. 2006. Return of teal to Campbell Island. Oryx 40: 137.

Preddey, J. 1995. Campbell Island Teal Anas aucklandica nesiotis bred in captivity. Wildfowl 46: 69-71.

Seddon, P. J.; Maloney, R. F. 2003. Campbell Island Teal re-introduction plan.

Williams, M.; Robertson, C. J. R. 1996. The Campbell Island Teal Anas aucklandica nesiotis: history and review. Wildfowl 47: 134-165.

Citation: BirdLife International. 2016. Anas nesiotis. The IUCN Red List of Threatened Species 2016: e.T22724580A94872487. . Downloaded on 17 August 2018.
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