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

Taxonomic note
Junco hyemalis and J. insularis (del Hoyo and Collar 2016) were previously lumped as J. hyemalis following AERC TAC (2003); AOU (1998 & supplements); Cramp et al. (1977-1994).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	D	D1+2

Red List history

Year	Category	Criteria
2016	Endangered	D
2012	Not Recognised
2008	Not Recognised
2004	Critically Endangered
2000	Critically Endangered
1996	Critically Endangered
1994	Critically Endangered
1988	Threatened

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	20 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	60 km2	medium
Extent of Occurrence (non-breeding)	56 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	75-249 mature individuals	poor	estimated	2016
Population trend	increasing	-	estimated	-
Generation length	3.6 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population size is unknown, but has increased in recent years (P. Salaman in litt. 2007) from only 50-100 birds in 1995 (Howell and Webb) owing to habitat management and the culling of goats, however it is still thought likely to number fewer than 250 mature individuals.

Trend justification: Although the population was previously in decline (Howell and Webb 1995a), it has increased in recent years (P. Salaman in litt. 2007).

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Mexico	extant	native	yes

Country/Territory	IBA Name
Mexico	Isla Guadalupe

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Rural Gardens	suitable	non-breeding
Forest	Boreal	suitable	breeding
Forest	Temperate	suitable	breeding
Shrubland	Temperate	suitable	non-breeding
Altitude	2600 - 3000 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Capra hircus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Guadalupe Junco Junco insularis. Downloaded from https://datazone.birdlife.org/species/factsheet/guadalupe-junco-junco-insularis on 23/11/2024.
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 23/11/2024.