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

Taxonomic source(s)
Brooke, M. de L. 2004. Albatrosses and Petrels Across the World. Oxford University Press, Oxford.
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
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
-	B2ab(iii)	A2e; B2ab(iii); D2

Red List history

Year	Category	Criteria
2019	Endangered	B2ab(iii)
2018	Endangered	B2ab(iii)
2016	Endangered	B2ab(iii)
2012	Endangered	B2ab(ii,iii)
2010	Endangered	B2a+b(ii,iii)
2008	Endangered	B2a+b(ii,iii)
2007	Endangered
2006	Endangered
2004	Endangered
2000	Endangered
1996	Endangered
1994	Endangered
1988	Lower Risk/Least Concern

Migratory status	full migrant	Forest dependency	does not normally occur in forest
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	16,700,000 km2	medium
Extent of Occurrence (non-breeding)	12,300,000 km2	medium
Area of Occupancy (breeding/resident)	5 km2	medium
Number of locations	2	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	medium	estimated	2004
Population trend	stable	medium	suspected	-
Rate of change over the past 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Generation length	19.5 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: Cuthbert and Davis (2002) estimated 106,000 breeding pairs. Brooke (2004) estimated a total population of 300,000-350,000 individuals.

Trend justification: For many years, this species has been considered to be in a long-term decline (Sherley 1992, Heather & Robertson 1997), but a major study has indicated that the population was stable from at least 1990 to 2000 (Taylor 2000). Recent evidence even points to an increase in the population for the Kowhai Valley at an annual rate of 1.7% over the last 20 years, based on burrow density (Sommer et al. 2009). This was confirmed in a study of marked and unmarked individuals, which found a population increase of 2% per year between 2002 and 2014 (Rowe et al. 2018). Given the long generation length of the species, it is precautionarily retained as stable.

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

Country/Territory	IBA Name
New Zealand	Canterbury (offshore)
New Zealand	Cook Strait
New Zealand	East Coast South Island (offshore)
New Zealand	Ka Whata Tu o Rakihouia/Kaikoura
New Zealand	Kaikoura (offshore)
New Zealand	Southern South Island (offshore)

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Grassland	Temperate	major	breeding
Marine Neritic	Pelagic	major	breeding
Marine Neritic	Pelagic	major	non-breeding
Marine Oceanic	Epipelagic (0-200m)	major	resident
Shrubland	Temperate	major	breeding
Altitude	1200 - 1800 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Fishing & harvesting aquatic resources - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Species mortality
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
		Future		Whole (>90%)		Slow, Significant Declines		Low Impact: 5
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Mustela erminea	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Sus domesticus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Ecosystem degradation, Species mortality
Pollution	Excess energy - Light pollution	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Hutton's Shearwater Puffinus huttoni. Downloaded from https://datazone.birdlife.org/species/factsheet/huttons-shearwater-puffinus-huttoni on 23/11/2024.
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 23/11/2024.