Pycroft's Petrel Pterodroma pycrofti


Taxonomic source(s)
Brooke, M. de L. 2004. Albatrosses and Petrels Across the World. Oxford University Press, Oxford.
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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - D2

Red List history
Year Category Criteria
2018 Vulnerable D2
2016 Vulnerable D2
2012 Vulnerable D2
2010 Vulnerable D2
2008 Vulnerable D2
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status full migrant Forest dependency Medium
Land mass type Average mass 159 g

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 98,900,000 medium
Extent of Occurrence breeding/resident (km2) 160 medium
Number of locations 5 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 12000-22000 poor estimated 2012
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 5 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 11 - - -

Population justification: The total breeding population is estimated at 5,000-10,000 pairs, equating to 12,000-22,000 mature individuals, within a total population of 30,000-40,000 individuals (G. Taylor in litt. 2012). There has been no population monitoring at any breeding colony (except the two translocation sites) since 2012 (G.Taylor in litt. 2016).

Trend justification: The population is increasing in response to rat eradication.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Fiji U Extant
High Seas N Extant Yes
Japan V Extant
Kiribati U Extant
Marshall Islands U Extant
Micronesia, Federated States of U Extant
Nauru U Extant
New Caledonia (to France) U Extant
New Zealand N Extant Yes
Solomon Islands U Extant
Tonga U Extant
Tuvalu U Extant
United States Minor Outlying Islands (to USA) N Extant Yes
USA N Extant Yes
Vanuatu U Extant
Wallis and Futuna Islands (to France) N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
High Seas Clipperton Fracture Zone Petrel Foraging Area
New Zealand North Eastern North Island (offshore)
New Zealand Repanga Cuvier island
New Zealand Mercury Islands
New Zealand Hen and Chicken Islands
New Zealand Taranga Hen Island
New Zealand Marotere Chickens Islands
New Zealand Poor Knights Islands
New Zealand Stephenson Island
New Zealand Pacific, Southwest 61 - Marine
New Zealand Poor Knights Islands
New Zealand Mercury Islands

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Temperate major breeding
Marine Neritic Pelagic suitable breeding
Marine Neritic Pelagic suitable non-breeding
Marine Oceanic Epipelagic (0-200m) major non-breeding
Marine Oceanic Epipelagic (0-200m) major breeding
Marine Oceanic Mesopelagic (200-1000m) major non-breeding
Shrubland Temperate major breeding
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Rattus exulans Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Reduced reproductive success

Recommended citation
BirdLife International (2021) Species factsheet: Pterodroma pycrofti. Downloaded from on 24/10/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from on 24/10/2021.