Sciurus arizonensis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Sciurus arizonensis
Species Authority: Coues, 1867
Common Name(s):
English Arizona Gray Squirrel

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Linzey, A.V., Timm, R., Álvarez-Castañeda, S.T., Castro-Arellano, I. & Lacher, T.
Reviewer(s): McKnight, M. (Global Mammal Assessment Team) & Amori, G. (Small Nonvolant Mammal Red List Authority)
Listed as Data Deficient in view of the absence of recent information on population trends, threats, and conservation status.
1996 Lower Risk/near threatened (Baillie and Groombridge 1996)

Geographic Range [top]

Range Description: This species occurs in south-western U.S.A. (Arizona and New Mexico) and adjoining Mexico (Sonora), with three disjunct population segments: western and southern mountains of central Arizona high country (below Mogollon Rim) and a few localities in western New Mexico, isolated mountain ranges in southern Arizona, and southern Arizona mountains extending into northern Sonora. Found between 1,120 and 2,700 m asl in elevation.
Mexico (Sonora); United States (Arizona, New Mexico)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species is uncommon and local. Its population status is unknown. The species is thought to fluctuate from year to year; probably due to food supplies from mast-producing trees, which varies each year.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This squirrel primarily occupies riparian deciduous and mixed forests of canyon bottoms and streamsides (Best and Reidel 1995; Reid 2006; J. Frey pers. comm.). The upper elevational limits are generally where oak-pine forests transition to pine. The lower elevational limits can extend into chaparral and desert grasslands. This species is rarely seen due to secretive nature. The Arizona walnut tree (Juglans major) is considered a key indicator of this species. It prefers food from mast-producing trees.
Systems: Terrestrial

Threats [top]

Major Threat(s): The destruction of habitat by wildfires is a major threat.

Conservation Actions [top]

Conservation Actions: There are several protected areas within this species' range. Research on ecology and biology, as well as population and conservation status is needed.

Citation: Linzey, A.V., Timm, R., Álvarez-Castañeda, S.T., Castro-Arellano, I. & Lacher, T. 2008. Sciurus arizonensis. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 31 March 2015.
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