• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic note
Closely related to and sometimes considered conspecific with C. iredalei, C. huegeli and C. aucklandica, but differs from them in its much smaller size (effect size for male bill difference 6.63; score 3); somewhat coarser breast streaking than in morphologically closest nominate aucklandica (1); apparently (fide published sonagrams (Higgins and Davies 1996)) different song structure (accelerating where aucklandica does not) and calls (at least 3). Monotypic.

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D2

Red List history

Year	Category	Criteria
2022	Vulnerable	D2
2016	Vulnerable	D2
2013	Vulnerable	D2
2012	Vulnerable	D2
2008	Vulnerable	D2
2006	Vulnerable
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	180 km2	medium
Area of Occupancy (breeding/resident)	40 km2	good
Number of locations	4	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1800-2200 mature individuals	medium	estimated	2021
Population trend	stable	medium	estimated	-
Generation length	4.18 years	-	-	-
Number of subpopulations	4	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The population is estimated at c.900-1,100 pairs. Higgins and Davies (1996) estimated the population to number 700-800 pairs on Rangatira (South East) Island, possibly 200-250 pairs on Mangere Island and fewer than 50 pairs on Little Mangere Island and Star Keys. The population is thus estimated to fall within the range 1,800-2,200 mature individuals, roughly equating to 2,700-3,300 individuals in total. Since the population is considered to be stable (Robertson et al. 2021), historic population estimates are thought to remain applicable.

Trend justification: Although the historical range of this species was reduced as the result of the introduction of predators such as cats Felis catus and rats Rattus spp. (Higgins and Davies 1996, Roberts and Miskelly 2003), the population is considered to have been stable throughout the last three generations  based on census data (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	Mangere
New Zealand	Rangatira South East Island
New Zealand	Star Keys Motuhope

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Temperate	major	resident
Grassland	Temperate	major	resident
Altitude	0 - 287 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Gallirallus australis	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Competition, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Named species	Timing		Scope		Severity		Impact
		Past, Likely to Return		Minority (<50%)		Slow, Significant Declines		Past Impact
		Stresses Reduced reproductive success

---

Recommended citation
BirdLife International (2024) Species factsheet: Chatham Islands Snipe Coenocorypha pusilla. Downloaded from https://datazone.birdlife.org/species/factsheet/chatham-islands-snipe-coenocorypha-pusilla on 23/12/2024.
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 23/12/2024.