|File name||Lead Author||Year||Type|
|A Field Study of Small Vertebrate Use of Wildlife Underpasses in San Diego County, 2014||Brehme, Cheryl; Clark, Denise; Fisher, Robert N.; Rochester, Carlton; Tracey, Jeff||2014||report|
|Habitat Management Plan for the Kelly Ranch Habitat Conservation Area||2002||report|
Restricted to the central and northern Baja California Peninsula and southwestern California . Range is widespread in the valleys of western Riverside and southwestern San Bernardino counties extending northwest to the vicinity of Claremont in Los Angeles County [2;3; both cited in 4]. Also found throughout western Baja California south to extreme northwestern Baja California Sur [2;5; both cited in 4]. Elevational range is from sea level to 1350 m (4500 ft) (Santa Rosa mountains, Riverside county) and 1800 m (6000 ft) (Cactus Flat, north slope of San Bernardino mountains) .
Within the MSPA, occurrences have been found in MU 1 (Sunset Cliffs), MU 3 (Crestridge), MU 4 (Mission Trails Regional Park, Sycamore Canyon and Goodan Ranch, Cleveland national Forest), MU 7 (TorreyPines), MU 6 (Elfin Forest Recreational Reserve, Santa Fe Valley), and MU 11 (Cleveland National Forest).
Common resident of sandy herbaceous areas, usually in association with rocks or coarse gravel [7;8; both cited in 6] in southwestern California. Occurs mainly in arid coastal and desert borders . Habitats tend to be stony soils above sandy desert fans and rocky areas within shrub communities such as coastal sage scrub, chamise-redshank chaparral, mixed chaparral, sagebrush, desert wash, desert scrub, desert succulent scrub, pinyon-juniper, and annual grassland [9, cited in 1;6].
C. fallax has 6 recognized species  with two subspecies found in southern California: C. f. fallax from southern California through the coastal sage zone into the northern part of the Baja California Peninsula and C.f. pallidus in the eastern San Bernardino Mountains in California [1;4;10]. Formerly recognized as a subgenus of Perognathus before elevated to full generic stature 11, cited in 12].
Nocturnal [6;13]. Solitary . Active year-round  though avoids high daytime temperatures in its burrows [8, cited in 6].
Breeding occurs chiefly from March to May . Females can produce 1-3 litters per year [15, cited in 13]. An average of 4 young comprise a litter. Gestation is around 24-26 days . Young become sexually mature at 5 to 6 months of age. Typical longevity in nature is only 4-6 months, but it is not unusual for some individuals to survive 1-2 years [15, cited in 13].
Forages on seeds of forbs, grasses, shrubs with a low to moderate preference for forb and shrub seeds, and a high preference for grass seeds . Seeds transported within cheek pouches where it is stored in and around its burrow. May feed on some insects. Water obtained metabolically .
Home range varied from 0.19 to 0.45 ha, averaging 0.3 ha [17, cited in 10] No difference between sexes in home range size, and little overlap between sexes in home ranges, possibly the result of territoriality . Territory probably the same size as home range .
Threatened by habitat fragmentation and loss due to development .
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 Álvarez-Castañeda, S.T., Castro-Arellano, I. , and Lacher, T. 2016. Chaetodipus fallax. The IUCN Red List of Threatened Species 2016. Available: http://www.iucnredlist.org/details/4330/0. Accessed: November 20, 2017.
 Hayden, P., J. J. Gambino, and R. G. Lindberg. 1966. Laboratory Breeding of the Little Pocket Mouse, Perognathus longimembris. Journal of Mammalogy 47:412-423.
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