• 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.
Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
A2be	A2be; D	A2be; D1+2

Red List history

Year	Category	Criteria
2018	Critically Endangered	A2be
2016	Critically Endangered	A2be
2015	Critically Endangered	A2be
2013	Critically Endangered	A2be
2012	Critically Endangered	A2be
2010	Critically Endangered	A2b,e
2009	Critically Endangered	A2b,e; C2a(ii)
2008	Critically Endangered
2006	Critically Endangered
2004	Critically Endangered
2000	Critically Endangered
1996	Extinct in the Wild
1994	Extinct in the Wild
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	95,100	medium
Number of locations	3	-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals	116	good	observed	2017
Population trend	Increasing	medium	observed	-
Decline (3 years/1 generation past)		-	-	-
Decline (5 years/1 generation past)		-	-	-
Decline (10 years/1 generation past)		-	-	-
Decline (10 years/3 generation future)		-	-	-
Decline (10 years/3 generation past and future)		-	-	-
Number of subpopulations	3	-	-	-
Percentage in largest subpopulation	1-89	-	-	-
Generation length (yrs)	27	-	-	-

Population justification: In 2017 there were 154 individuals, including 116 adults (Department of Conservation 2017). In 2018, following several deaths, there were 149 individuals remaining (Department of Conservation 2018).

Trend justification: The species was described as still abundant in Fiordland and some other parts of South Island in the early twentieth century. The current population comprises 149 individuals (Department of Conservation 2018), but although the population is now increasing, it has declined by >80% in the last 100 years (P. Jansen in litt. 2004, D. Merton in litt. 2005, Merton 2009) and is likely to have declined by >80% in the last three generation lengths (81 years).

Country/Territory	Occurrence status	Presence	Resident	Breeding	Non-breeding	Passage
New Zealand	N	Extant	Yes

Country/Territory	IBA Name
New Zealand	Whenua Hou Codfish Island
New Zealand	Chalky Preservation Inlets
New Zealand	Port Pegasus
New Zealand	Te Hauturu-o-Toi Little Barrier Island

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Pastureland	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Forest	Temperate	major	resident
Altitude	0 - 700 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Erysipelothrix rhusiopathiae	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Mustela erminea	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus exulans	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Species mortality

Purpose	Primary form used	Life stage used	Source	Scale	Level	Timing
Pets/display animals, horticulture	-	-	-	International	Non-trivial	Recent
Pets/display animals, horticulture	-	-		International	Non-trivial	Recent

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Recommended citation
BirdLife International (2021) Species factsheet: Strigops habroptila. Downloaded from http://www.birdlife.org on 15/10/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/10/2021.