LC
Northern Harrier Circus hudsonius



Taxonomy

Taxonomic note

Circus cyaneus and C. hudsonius (del Hoyo and Collar 2014) were previously lumped as C. cyaneus following Sibley and Monroe (1990, 1993).

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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

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

Red List history
Year Category Criteria
2016 Least Concern
2014 Least Concern
Species attributes

Migratory status full migrant Forest dependency Low
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 19,000,000 medium
Extent of Occurrence non-breeding (km2) 9,100,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 0
Population trend Decreasing estimated -
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 - - -
Largest subpopulations - - -
Generation length (yrs) 7.8 - - -

Trend justification: This species has undergone a small or statistically insignificant decrease over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Antigua and Barbuda N Extant Yes
Bahamas N Extant Yes
Barbados N Extant Yes
Belize N Extant Yes
Bermuda (to UK) V Extant
Bonaire, Sint Eustatius and Saba (to Netherlands) N Extant Yes
Canada N Extant Yes
Cayman Islands (to UK) N Extant Yes
Colombia N Extant Yes
Costa Rica N Extant Yes Yes
Cuba N Extant Yes
Curaçao (to Netherlands) N Extant Yes
Dominica N Extant Yes
Dominican Republic N Extant Yes
El Salvador N Extant Yes
Faroe Islands (to Denmark) V Extant
Grenada N Extant Yes
Guadeloupe (to France) N Extant Yes
Guatemala N Extant Yes Yes
Haiti N Extant Yes
Honduras N Extant Yes Yes
Jamaica N Extant Yes
Martinique (to France) N Extant Yes
Mexico N Extant Yes
Montserrat (to UK) N Extant Yes
Nicaragua N Extant Yes Yes
Panama N Extant Yes
Puerto Rico (to USA) N Extant Yes
Sint Maarten (to Netherlands) N Extant Yes
St Kitts and Nevis N Extant Yes
St Lucia N Extant Yes
St Pierre and Miquelon (to France) N Extant Yes Yes
St Vincent and the Grenadines N Extant Yes
Turks and Caicos Islands (to UK) N Extant Yes
USA N Extant Yes
Venezuela N Extant Yes
Virgin Islands (to UK) N Extant Yes
Virgin Islands (to USA) N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Mexico Bahia de Ceuta-Cospita

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Pastureland suitable non-breeding
Artificial/Terrestrial Pastureland suitable breeding
Artificial/Terrestrial Plantations suitable breeding
Forest Boreal suitable breeding
Grassland Subtropical/Tropical Dry suitable non-breeding
Grassland Temperate suitable breeding
Grassland Temperate suitable non-breeding
Shrubland Boreal suitable breeding
Shrubland Temperate suitable non-breeding
Shrubland Temperate suitable breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands suitable breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands suitable non-breeding
Altitude 0 - 3000 m Occasional altitudinal limits (max) 5000 m

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - - Non-trivial Recent
Sport hunting/specimen collecting - - - Non-trivial Recent

Recommended citation
BirdLife International (2017) Species factsheet: Circus hudsonius. Downloaded from http://www.birdlife.org on 17/12/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/12/2017.