• Summary
• Text account
• Data table and detailed info
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Taxonomic note

Petroica macrocephala and P. dannefaerdi (del Hoyo and Collar 2016) were previously lumped as P. macrocephala following Sibley & Monroe (1990, 1993), Turbott (1990).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D1+2

Red List history

Year	Category	Criteria
2022	Vulnerable	D1+2
2016	Vulnerable	D1+2
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	12 km2
Area of Occupancy (breeding/resident)	12 km2
Number of locations	2	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	medium	estimated	2022
Population trend	stable	-	estimated	-
Generation length	3.73 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: Based on a density of 2.7 pairs per ha, the population has been estimated at around 500 pairs (McLean and Miskelly 1988) and is still thought to be stable (Robertson et al. 2021), conservatively placed here in the range of 250-999 mature individuals.

Trend justification: The population density appears to have remained fairly stable since the late 1940s (Miskelly et al. 2001). Overall the population is considered to have been stable within the last three generations (Robertson et al. 2013, 2017, 2021).

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

Country/Territory	IBA Name
New Zealand	Snares (eastern islands)

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Temperate	major	resident
Altitude	0 - 130 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 - Unspecified species	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Very Rapid Declines		Medium Impact: 7
		Stresses Species mortality

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Recommended citation
BirdLife International (2025) Species factsheet: Snares Tomtit Petroica dannefaerdi. Downloaded from https://datazone.birdlife.org/species/factsheet/snares-tomtit-petroica-dannefaerdi on 21/01/2025.
Recommended citation for factsheets for more than one species: BirdLife International (2025) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 21/01/2025.