LC
Rhinoceros Auklet Cerorhinca monocerata



Taxonomy

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.

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

Red List history
Year Category Criteria
2018 Least Concern
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 18,400,000 medium
Extent of Occurrence non-breeding (km2) 30,100,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals poor estimated 1996
Population trend Decreasing suspected -
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 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 8 - - -

Population justification: The global population is estimated to number > c.1,300,000 individuals (del Hoyo et al. 1996), while national population estimates include: < c.1,000 wintering individuals in Korea; c.10,000-1 million breeding pairs c.1,000-10,000 wintering individuals in Japan and c.10,000-100,000 breeding pairs in Russia (Brazil 2009).

Trend justification: The population is suspected to be in decline owing to bycatch, predation by invasive species and climate change.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Canada N Extant Yes
China (mainland) N Extant Yes
Japan N Extant Yes
Mexico N Extant Yes
North Korea N Extant Yes
Russia N Extant Yes
Russia (Asian) N Extant Yes
South Korea N Extant Yes
USA N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Japan Teuri island
Japan Yururi and Moyururi islets
Japan Matsumae islets
Russia (Asian) Kuril islands (between Urup and Paramushir)
Russia (Asian) Tyuleniy Island
Canada Scott Island Group
Canada Duke of Edinburgh Ecological Reserve
Canada Anthony Island
Canada Englefield Bay Islands
Canada Sidney Channel
Canada Cleland Island and Southeast Clayoquot Sound
Canada Amphitrite and Swiftsure Banks
Canada Smith Sound Islets
Canada Moore and Byers Islands and Banks
Canada Lucy Islands
Canada Kunghit Island and Luxana Bay
Canada Skincuttle Inlet Islands
Canada Cumshewa Inlet north to Sheldens Bay
Russia (Asian) Kuril islands (between Urup and Paramushir) - Marine
Japan Northern Hokkaido - Marine
Japan Sanriku coast and Matsumaekojima - Marine
Russia (Asian) Aniva bay / Esashi, Menashidomari / Teurito island - Marine
USA Outer Islands Marine
USA Forrester Island Colonies
USA Castle Rock
USA Olympic Continental Shelf
USA Farallon Islands
USA Point Reyes - Outer
USA Trinidad Complex
Russia (Asian) Lesser Kuril Ridge and Kunashir Island
Japan Eastern Hokkaido - Marine

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Temperate major breeding
Marine Neritic Macroalgal/Kelp major resident
Marine Neritic Pelagic major resident
Marine Neritic Seagrass (Submerged) major resident
Marine Neritic Subtidal Loose Rock/pebble/gravel major resident
Marine Neritic Subtidal Rock and Rocky Reefs major resident
Marine Neritic Subtidal Sandy major resident
Marine Neritic Subtidal Sandy-Mud major resident
Marine Oceanic Epipelagic (0-200m) suitable resident
Marine Oceanic Mesopelagic (200-1000m) suitable resident
Altitude 0 - 200 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Fishing & harvesting aquatic resources - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Indirect ecosystem effects, Ecosystem degradation, Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species disturbance, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Procyon lotor Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species disturbance, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Vulpes lagopus Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Indirect ecosystem effects, Reduced reproductive success, Species mortality
Pollution Industrial & military effluents - Oil spills Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Reduced reproductive success

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

Recommended citation
BirdLife International (2022) Species factsheet: Cerorhinca monocerata. Downloaded from http://www.birdlife.org on 26/06/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/06/2022.