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

Taxonomic note
Anser rossii (del Hoyo and Collar 2014) was previously placed in the genus Chen.

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#.
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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2021	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

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 (km2)	3,960,000	medium
Extent of Occurrence non-breeding (km2)	2,850,000	medium
Number of locations		-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals	2100000	poor	estimated	2020
Population trend	Increasing		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		-	-	-
Percentage in largest subpopulation		-	-	-
Generation length (yrs)	6.9	-	-	-

Population justification: The global population is estimated to number 2,100,000 mature individuals (Partners in Flight 2020).

Trend justification: The species is undergoing a large increase, at an average rate of 12% per year (Partners in Flight 2020; see also Wetlands International 2020).

Country/Territory	Occurrence status	Presence	Resident	Breeding	Non-breeding	Passage
Bahamas	V	Extant
Canada	N	Extant		Yes		Yes
Mexico	N	Extant			Yes
Netherlands	V	Extant
Russia	V	Extant
Russia (Asian)	V	Extant
USA	N	Extant		Yes	Yes	Yes

Country/Territory	IBA Name
Canada	Churchill and Vicinity
Canada	Queen Maud Gulf
Canada	McConnell River
Canada	Jenny Lind Island
Canada	St. Mary's River Complex (Echo Bay ON to Maxton Bay MI)
Canada	Luck Lake
Canada	Cabri Area
Canada	Barber Lake
Mexico	Laguna de Mexicanos
Mexico	Complejo de Humedales del Noroeste de Chihuahua
Mexico	Laguna de Bustillos

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Aquatic & Marine	Artificial/Aquatic - Water Storage Areas (over 8ha)	suitable	non-breeding
Artificial/Terrestrial	Arable Land	major	non-breeding
Artificial/Terrestrial	Pastureland	major	non-breeding
Grassland	Tundra	major	breeding
Rocky areas (eg. inland cliffs, mountain peaks)		suitable	breeding
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	suitable	non-breeding
Altitude	0 - 2500 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation

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

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Recommended citation
BirdLife International (2022) Species factsheet: Anser rossii. Downloaded from http://www.birdlife.org on 16/05/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 16/05/2022.