NT
Red Knot Calidris canutus



Taxonomy

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: http://www.aerc.eu/DOCS/Bird_taxa_of_the_WP15.xls.
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
Cramp, S. and Simmons, K.E.L. (eds). 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. 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.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.
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
- - -

Red List history
Year Category Criteria
2024 Near Threatened A2bcd+4bcd
2018 Near Threatened A2abc+3bc+4abc
2016 Near Threatened A2abc+3bc+4abc
2015 Near Threatened A2abc+3bc+4abc
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 full migrant Forest dependency does not normally occur in forest
Land-mass type Average mass 142 g
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 17,800,000 km2 medium
Extent of Occurrence (non-breeding) 300,000,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 2000000-3000000 mature individuals medium estimated 2024
Population trend decreasing - estimated 2008-2027
Rate of change over the past 10 years/3 generations (longer of the two periods) 15-29% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 15-29% - - -
Generation length 6.4 years - - -
Number of subpopulations 6 - - -
Percentage of mature individuals in largest subpopulation 1-89% - - -

Population justification: Extrapolating data from the Program for Regional and International Shorebird Monitoring (PRISM) surveys on the species' breeding grounds in Canada, Bart et al. (in prep.) estimated a population size of 1.2 million of islandica and rufa combined, a figure nearly 10 times higher than that calculated by Andres et al. (2012). This estimate does not include populations of islandica in northern Greenland. Taxon canutus was estimated by van Roomen et al. (2015) to number c.250,000, but was revised upwards by van Roomen et al. (2022) for the period 2016-2020 to 260,000-275,000; the latter is accepted here but may still be an underestimate based on breeding densities elsewhere (Bart et al. in prep.). Taxa piersmai and rogersi were estimated, respectively, to number 50,000-62,000 and 48,500-60,000 birds (Clemens et al. 2021), while roselaari probably numbers only c.17,000 (Andres et al. 2012). Combining all these estimates, the global population size is thought to number at least 2 million breeding birds, with an upper bound set to 3 million.

Trend justification: Trends vary across populations but a collation of these suggests moderately rapid declines in this species over the past three generations (19 years). The overall trend of Canadian breeding taxa islandica and rufa, which together comprise a majority of the global population, is difficult to determine. Based on extensive counts on the Atlantic coast of North America, Smith et al. (2023) estimated catastrophic declines equivalent to 88.5% over three generations (evidence of population collapse is also provided by Andres et al. [2012] and USFWS [2014]), but van Roomen et al. (2022) estimated that wintering islandica in western Europe had a stable population trend. Taxon canutus, which is estimated to comprise approximately c.10-12% of the species' global abundance, was estimated by van Roomen et al. (2022) to be declining at a rate equivalent to c.54% over three generations, based on an extrapolation of data from between 2011 and 2020. Rogers et al. (2023) also found a stable trend in Australian populations (piersmai and rogersi combined). The population trend of roselaari is unknown, although this population comprises only <1% of the global population.
Combining these data into a single global population trend is hampered by the disparate trends shown by Smith et al. (2023) and van Roomen et al. (2022). Because a very large proportion of the population of rufa/islandica estimated by Bart et al. (in prep.) is thought to comprise European-wintering islandica, the stable trend of van Roomen et al. (2022) is thought to be more representative. Nonetheless, the combination of Smith et al. (2023) and the trend in C. c. canutus (van Roomen et al. 2022) provide evidence of localised rapid population decline, which are thought to have resulted in a global decline of 15-29% over the past three generations. Future rates of decline are highly uncertain and not estimated here; it is plausible that global rates of decline will slow as taxon canutus becomes an increasingly less significant part of the species' global status; alternatively threats (which for this species are not wholly understood) driving population declines in some populations may begin to affect others.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Albania extant native yes yes
Algeria extant native yes yes
Angola extant native yes yes
Anguilla (to UK) extant native yes yes
Antigua and Barbuda extant native yes yes
Argentina extant native yes yes
Aruba (to Netherlands) extant native yes yes
Australia extant native yes yes
Austria extant native yes
Azerbaijan extant native yes
Bahamas extant native yes yes
Bangladesh extant native yes yes
Barbados extant native yes
Belarus extant native yes
Belgium extant native yes yes
Belize extant native yes yes
Benin extant native yes yes
Bermuda (to UK) extant native yes
Bolivia extant native yes
Bonaire, Sint Eustatius and Saba (to Netherlands) extant native yes yes
Botswana extant native yes
Brazil extant native yes yes
Brunei extant native yes yes
Bulgaria extant native yes yes
Cameroon extant native yes yes
Canada extant native yes yes
Cape Verde extant native yes
Cayman Islands (to UK) extant native yes yes
Chile extant native yes yes
China (mainland) extant native yes yes
Colombia extant native yes yes
Congo extant native yes yes
Congo, The Democratic Republic of the extant native yes yes
Costa Rica extant native yes yes
Côte d'Ivoire extant native yes yes
Croatia extant native yes yes
Cuba extant native yes yes
Curaçao (to Netherlands) extant native yes yes
Cyprus extant native yes yes
Czechia extant native yes
Denmark extant native yes yes
Dominica extant native yes yes
Dominican Republic extant native yes yes
Ecuador extant native yes yes
Egypt extant native yes
El Salvador extant native yes yes
Equatorial Guinea extant native yes yes
Estonia extant native yes
Falkland Islands (Malvinas) extant native yes
Faroe Islands (to Denmark) extant native yes
Fiji extant native yes
Finland extant native yes
France extant native yes yes
French Guiana extant native yes yes
French Southern Territories extant native yes
Gabon extant native yes yes
Gambia extant native yes yes
Georgia extant native yes
Germany extant native yes yes
Ghana extant native yes yes
Gibraltar (to UK) extant native yes yes
Greece extant native yes yes
Greenland (to Denmark) extant native yes yes
Grenada extant native yes
Guadeloupe (to France) extant native yes yes
Guam (to USA) extant native yes
Guatemala extant native yes yes
Guinea extant native yes yes
Guinea-Bissau extant native yes yes
Guyana extant native yes yes
Haiti extant native yes yes
Honduras extant native yes yes
Hong Kong (China) extant native yes yes
Hungary extant native yes
Iceland extant native yes
India extant native yes yes
Indonesia extant native yes yes
Iran, Islamic Republic of extant native yes
Iraq extant native yes
Ireland extant native yes yes
Israel extant native yes
Italy extant native yes yes
Jamaica extant native yes yes
Japan extant native yes yes
Jordan extant native yes
Kazakhstan extant native yes
Kenya extant native yes
Kuwait extant native yes
Latvia extant native yes
Lebanon extant native yes yes
Liberia extant native yes yes
Libya extant native yes yes
Luxembourg extant native yes
Macao (China) extant native yes yes
Malaysia extant native yes yes
Mali extant native yes
Malta extant native yes yes
Martinique (to France) extant native yes yes
Mauritania extant native yes yes
Mexico extant native yes yes
Monaco extant native yes yes
Mongolia extant native yes
Montenegro extant native yes yes
Montserrat (to UK) extant native yes yes
Morocco extant native yes yes
Mozambique extant native yes
Myanmar extant native yes yes
Namibia extant native yes yes
Nepal extant native yes
Netherlands extant native yes yes
New Zealand extant native yes yes
Nicaragua extant native yes yes
Nigeria extant native yes yes
North Korea extant native yes
North Macedonia extant native yes
Norway extant native yes
Oman extant native yes
Pakistan extant native yes
Palau extant native yes
Panama extant native yes yes
Papua New Guinea extant native yes yes
Paraguay extant native yes
Peru extant native yes yes
Philippines extant native yes yes
Poland extant native yes
Portugal extant native yes yes
Puerto Rico (to USA) extant native yes yes
Romania extant native yes
Russia extant native yes yes
Russia (Asian) extant native yes yes
Russia (Central Asian) extant native yes yes
São Tomé e Príncipe extant native yes yes
Saudi Arabia extant native yes
Senegal extant native yes yes
Serbia extant native yes
Seychelles extant native yes
Sierra Leone extant native yes yes
Singapore extant native yes yes
Slovakia extant native yes
Slovenia extant native yes yes
Somalia extant native yes
South Africa extant native yes yes
South Georgia & the South Sandwich Islands extant native yes
South Korea extant native yes
Spain extant native yes yes
Sri Lanka extant native yes yes
St Barthelemy (to France) extant native yes yes
St Kitts and Nevis extant native yes yes
St Lucia extant native yes yes
St Martin (to France) extant native yes yes
St Pierre and Miquelon (to France) extant native yes
St Vincent and the Grenadines extant native yes yes
Sudan extant native yes
Suriname extant native yes
Sweden extant native yes
Switzerland extant native yes
Syria extant native yes yes
Taiwan, China extant native yes yes
Tanzania extant native yes
Thailand extant native yes yes
Timor-Leste extant native yes
Togo extant native yes yes
Trinidad and Tobago extant native yes yes
Tunisia extant native yes yes
Türkiye extant native yes yes
Turks and Caicos Islands (to UK) extant native yes yes
Ukraine extant native yes
United Arab Emirates extant native yes
United Kingdom extant native yes yes
Uruguay extant native yes yes
USA extant native yes yes yes
Venezuela extant native yes yes
Vietnam extant native yes yes
Virgin Islands (to UK) extant native yes yes
Virgin Islands (to USA) extant native yes yes
Western Sahara extant native yes yes
Yemen extant native yes
Zambia extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Argentina Reserva Costa Atlántica de Tierra del Fuego y zonas adyacentes
Argentina San Antonio Oeste
Australia Eighty Mile Beach
Brazil Baixada Maranhense
Brazil Banhado do Maçarico e Cordões Litorâneos Adjacentes
Brazil Mangue Seco
Brazil Parque Nacional da Lagoa do Peixe
Brazil Reentrâncias Maranhenses / Paraenses
Canada Batture aux Alouettes and mouth of Saguenay River
Chile Bahía Lomas
Chile Marisma Buque Quemado
China (mainland) Shuangtai (Shuangtaizi) Estuary and Inner Gulf of Liaodong
Colombia Complejo de Humedales Costeros de la Guajira
Costa Rica Nicoya Gulf mangroves and coastal areas
Denmark Fanø
Denmark Mandø
Denmark Tøndermarsken, Magisterkog and Rudbøl Sø
Denmark Vadehavet (Wadden Sea)
France Baie du Mont Saint Michel et Ile des Landes
France Bassin d'Arcachon et Banc d'Arguin
France Estuaire de la Charente
France Estuaires picards : baies de Somme et d'Authie
France Ile d'Oléron, marais de Brouage-Saint-Agnant
France Marais poitevin et baie de l'Aiguillon
France Pointe de Grave
French Guiana Amana
Germany Hamburg Wadden Sea National Park
Germany Lower Saxony Wadden Sea National Park
Germany Rysumer Nacken
Germany Schleswig-Holstein Wadden Sea National Park (includes the Halligs, Kniepsand/Amrum, Lister Koog, Rantumbecken, Rickelsb
Greenland (to Denmark) Hochstetter Forland
Greenland (to Denmark) South coast of Germania Land, and Slaedelandet
Guinea-Bissau Arquipélago dos Bijagós
Guinea-Bissau Cantanhez forests
Guinea-Bissau Ilha de Bolama - Rio Grande de Buba
Guinea-Bissau Lagoas de Cufada
Guinea-Bissau Rio Cacheu
Guinea-Bissau Rio Mansôa and Gêba estuary
Guinea-Bissau Rio Tombali, Rio Cumbijã and Ilha de Melo
Guyana Guyana East Coast
Honduras Golfo de Fonseca
Iceland Alftafjordur-Hofsstadavogur
Iceland Alftanes-Akrar
Iceland Longufjorur
Iceland Melrakkasletta
Iceland Skerjafjordur
Iceland Stokkseyri-Eyrarbakki
Ireland Boyne estuary
Ireland Dublin Bay
Ireland Dundalk Bay
Ireland Nanny estuary and shoreline
Ireland Rogerstown estuary
Malaysia Sadong-Saribas coast
Mauritania Aftout Es Sâheli
Mauritania Banc d'Arguin National Park
Mauritania Diawling National Park
Mexico Área de San Quintín
Mexico Bahía Navachiste
Mexico Bahía Santa María
Mexico Bahía Todos Santos
Mexico Complejo Lagunar Ojo de Liebre
Mexico Istmo de Tehuantepec - Mar Muerto
Mexico Marismas Nacionales
Mexico Ría Celestún
Mexico Ría Lagartos
Mexico Zonas Húmedas de Yávaros
Morocco Baie d'Ad Dakhla
Netherlands Oosterschelde
Netherlands Wadden Sea
Norway Balsfjord
Norway Inner Porsangerfjord
Norway Lille Porsangen
Russia (Asian) Aniva bay
Russia (Asian) Kuril islands (between Urup and Paramushir)
Russia (Asian) Lesser Kuril Ridge and Kunashir Island
Russia (Asian) Lower Nizhnyaya Taymyra river
Russia (Asian) Moroshechnaya River
Russia (Asian) Nevskoye Lake
Russia (Asian) North-east Sakhalin lagoons
Russia (Asian) Ola lagoon
Russia (Asian) Tyk and Viakhtu bays
Senegal Delta du Saloum
Senegal Joal-Fadiouth
Senegal Kalissaye Avifaunal Reserve
Senegal La Petite Côte
Senegal Niayes (from Dakar to St Louis)
Senegal Parc National de la Langue de Barbarie
Sierra Leone Yawri Bay
South Africa West Coast National Park and Saldanha Bay islands
Svalbard and Jan Mayen Islands (to Norway) Nordenskiöldkysten
Svalbard and Jan Mayen Islands (to Norway) Sassen-Bünsow Land
Svalbard and Jan Mayen Islands (to Norway) South Spitsbergen National Park
United Kingdom Benfleet and Southend Marshes
United Kingdom Dee Estuary
United Kingdom Firth of Forth
United Kingdom Gibraltar Point
United Kingdom Humber Estuary
United Kingdom Lindisfarne
United Kingdom Mersey Narrows and North Wirral Foreshore
United Kingdom Mid-Essex Coast
United Kingdom Montrose Basin
United Kingdom Moray Basin, Firths and Bays
United Kingdom Morecambe Bay
United Kingdom North Norfolk Coast
United Kingdom Ribble and Alt Estuaries
United Kingdom Stour and Orwell Estuaries
United Kingdom Strangford Lough and islands
United Kingdom Teesmouth and Cleveland Coast
United Kingdom The Swale
United Kingdom The Wash
United Kingdom Upper Solway Flats and Marshes
USA Cape Hatteras National Seashore
USA Cape Lookout National Seashore
USA Delaware Bayshore Region
USA Delaware Coastal Zone
Venezuela Refugio de Fauna Silvestre y Reserva de Pesca Ciénaga de Los Olivitos

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Tundra major breeding
Marine Intertidal Mud Flats and Salt Flats major non-breeding
Marine Intertidal Rocky Shoreline suitable non-breeding
Marine Intertidal Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc suitable non-breeding
Marine Intertidal Shingle and/or Pebble Shoreline and/or Beaches suitable non-breeding
Marine Intertidal Tidepools suitable non-breeding
Marine Neritic Estuaries major non-breeding
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) suitable breeding
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) suitable breeding
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Marine & freshwater aquaculture - Industrial aquaculture Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Fishing & harvesting aquatic resources - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species disturbance, Species mortality
Biological resource use Hunting & trapping terrestrial animals - Unintentional effects (species is not the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species disturbance, Species mortality
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Energy production & mining Renewable energy Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Species mortality
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species disturbance, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Pollution Industrial & military effluents - Oil spills Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Species mortality
Residential & commercial development Commercial & industrial areas Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation
Purpose Scale
Food - human subsistence, national
Sport hunting/specimen collecting subsistence, national

Recommended citation
BirdLife International (2024) Species factsheet: Red Knot Calidris canutus. Downloaded from https://datazone.birdlife.org/species/factsheet/red-knot-calidris-canutus 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.