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

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.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	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	not a migrant	Forest dependency	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	6,390,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1500000-3400000 mature individuals	poor	estimated	2020
Population trend	increasing	-	estimated	-
Generation length	4.64 years	-	-	-

Population justification: The global population has been estimated at 7,500,000 mature individuals (Partners in Flight 2020). In North America (USA and Canada), the total population size is estimated at 2,200,000 mature individuals (Partners in Flight 2020). This species is considered to have a high dependency on forest habitat, and tree cover is estimated to have declined by 15.5% within its mapped range over the past three generations (13.92 years) (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). In North America (USA and Canada), the species population is estimated to have a slightly positive annual trend, which equates to a rapid increase in population size over three generations (Partners in Flight 2024). Based on this data, and the proportion of the species' global range that North America holds, the global population size is considered to be increasing at a rapid rate over three generations.

Trend justification: This species has undergone a small or statistically insignificant increase over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007). Note, however, that these surveys cover less than 50%.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Belize	extant	native	yes
Canada	extant	vagrant			yes
Colombia	extant	native	yes
Costa Rica	extant	native	yes
El Salvador	extant	native	yes
Guatemala	extant	native	yes
Honduras	extant	native	yes
Mexico	extant	native	yes
Nicaragua	extant	native	yes
Panama	extant	native	yes
USA	extant	native		yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Pastureland	suitable	resident
Forest	Subtropical/Tropical Dry	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Forest	Temperate	major	resident
Grassland	Subtropical/Tropical Dry	suitable	resident
Grassland	Temperate	suitable	resident
Altitude	0 - 4400 m	Occasional altitudinal limits

Purpose	Scale
Food - human	subsistence, national
Other household goods	subsistence, national
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Acorn Woodpecker Melanerpes formicivorus. Downloaded from https://datazone.birdlife.org/species/factsheet/acorn-woodpecker-melanerpes-formicivorus 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.