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Mammal Checklists of the United States

Mammals of the Yuma Field Office

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Yuma, Arizona


BLM Arizona Yuma Field Office

The Yuma Field Office encompasses 1.6 million acres of public land in Arizona and California. Habitats vary from aquatic river, lake, and marsh environments to terrestrial uplands with broad sandy plains, rocky foothills, and desert mountains. Vegetation ranges from wetland and riparian species such as cattail, willow, and cottonwood, to desert plants like creosotebush, palo verde, and saguaro cactus.

Bighorn sheep, kit fox, and many more species find food, cover, and room to roam on your public lands. Among their many uses, these lands serve as habitat for a variety of fish and wildlife species. This list of 63 mammals found within the boundary of Yuma Field Office has been prepared to help you better appreciate, and more fully experience, our desert wildlife.

Please be alert and sensitive to the disturbance your presence may cause some species. Enjoy wildlife from a distance. For information concerning State or Federal laws pertaining to wildlife, please contact your nearest representative of the Arizona Game and Fish Department or California Department of Fish and Game.

If you observe an animal that is not listed here, we would appreciate being informed. Please send your comments to:

Bureau of Land Management
Yuma Field Office
2555 East Gila Ridge Road
Yuma, AZ 85365
520-317-3200

Abundance

An abundance code follows each species name. These are general and should be used only as a guide.

A - Abundant - Present in large numbers in suitable habitat
C - Common - Usually seen in suitable habitat
LC - Locally Common - Inhabits fairly restricted areas; usually seen in these areas
U - Uncommon - Present, but not often seen
R - Rare - Seen very infrequently


Shrews

Desert shrew (Notiosorex crawfordi) LC
Occurs in any arid habitat with adequate cover.

Bats

California leaf-nosed bat (Macrotus californicus) LC
A year-round inhabitant of desert scrub, this bat roosts in mine tunnels or caves during the day.
Lesser long-nosed bat (Leptonycteris curasoae) R
Also called the Sanborn's long-nosed bat, this species may occur on the eastern edge of the field office during the summer.
Arizona myotis (Myotis occultus) R
This migratory species has been found along the lower Colorado River.
Yuma myotis (Myotis yumanensis) LC
Occurs near permanent water and emerges from its roost early in the evening.
Cave myotis (Myotis velifer) C
Occurs in this area during summer and usually roosts within a few miles of water.
California myotis (Myotis californicus) C
These bats fly early in the evening and roost in cracks and crevices in rocky canyons, as well as in caves and mine shafts.
Silver-haired bat (Lasionycteris noctivagans) R
One record of this bat exists in the field office, at a mine north of Quartzsite, Arizona.
Western pipistrelle (Pipistrellus hesperus) C
The smallest bat in the U.S., this species is often seen before sunset and flies slowly and erratically.
Big brown bat (Eptesicus fuscus) LC
Often found in wooded areas, this large bat also occurs in desert scrub.
Western yellow bat (Lasiurus xanthinus) U
Roosts in fan palms and other leafy urban plants in the Yuma area.
Hoary bat (Lasiurus cinereus) R
Found in wooded area, inclufing riparian areas along the lower Colorado River, where it roosts in trees during the day.
Spotted bat (Euderma maculatum) R
Little is known about the habitat requirements of this species, but it appears to be associated with rocky cliffs and water sources.
Townsend's big-eared bat (Plecotus townsendi) R
Found within the field office boundaries during summer, this species tends to fly late in the evening.
Pallid bat (Antrozous pallidus) LC
This bat emerges late at night and often forages on the ground.
American free-tailed bat (Tadaria brasiliensis) C
Also called the Mexican free-tailed bat, this species inhabits the field office year-round. It occurs in desert scrub habitats an the foothills of higher mountains.
Pocketed free-tailed bat (Tadaria femorosaccus) U
This species occurs near rocky cliffs and slopes. It gives a loud, high-pitched call when it leaves its perch at night.


Rabbits

Desert cottontail (Sylvilagus audubonii ) C
Usually found in thick vegetation along river bottoms, mesquite thickets, and near agricultural fields.
Black-tailed jack rabbit (Lepus californicus) C
An animal of the open desert and low shrub habitats, the jackrabbit depends on its keen hearing and bursts of spped to escape from predators.


Rodents

Harris' antelope squirrel (Ammospermophilus harrisii) C
This species occurs east of the Colorado River.
White-tailed antelope squirrel (Ammospermophilus leucurus) LC
This species occurs west of the Colorado River.
Round-tailed ground squirrel (Spermophilus teretcaudus) C
Found in flat, sandy areas with creosotebush, the ground squirrel builds extensive burrow systems.
Fox squirrel (Sciurus niger) LC
Introduced into the city of Yuma, this squirrel occurs in several neighborhoods with large shade trees.
Botta's pocket gopher (Thomomys bottae) LC
The largest populations occur in dense growths of arrowweed and in agricultural areas.
Little pocket mouse (Perognathus longimembris)LC
Found on both sides of the Colorado River in areas of desert pavement and sandy soils.
Arizona pocket mouse (Perognathus amplus) LC
Found only in Arizona, this species occurs in desert scrub habitats in the eastern part of the field office.
Long-tailed pocket mouse (Perognathus formosus) R
This species prefers rocky or gravelly areas and occurs west of the Colorado River.
Bailey's pocket mouse (Perognathus baileyi) R
Occurs on rocky slopes.
Desert pocket mouse (Perognathus penicillatus) C
Present on both sides of the Colorado River where it occurs in sparsely vegetated sandy deserts.
Rock pocket mouse (Perognathus intermedius) C
Found on the Arizona side of the Colorado River and restricted to rocky, desert scrub habitats.
Spiny pocket mouse (Perognathus spinatus) C
Found only west of the Colorado River, this species occurs near seeps or wet areas with tamarisk or mesquite.
Desert kangaroo rat (Dipodomys deserti) LC
This species is found in areas with loose, windblown sand and eats seeds. Kangaroo rats do not require drinking water or succulent foods and can survive on the water produced within their bodies.
Merriam's kangaroo rat (Depodomys merriami) C
Prefers sandy soils, except where its range overlaps other kangaroo rats.
Beaver (Castor canadensis) C
Found along the lower Colorado River where it usually digs underwater burrows into the river bank.
Western harvest mouse (Reithrodontomys megalotis) C
Often found in dense riparian vegetation.
Cactus mouse (Peromyscus eremicus) C
Found in rocky or sandy areas with cacti or creosotebush.
Deer mouse (Peromyscus maniculatus) C
Found in almost all habitats except the most arid desert areas. Most abundant in riparian areas.
Canyon mouse (Peromyscus crinitus) U
This secretive mouse lives on nearly barren canyon walls, cliffs, and rocky slopes.
Southern grasshopper mouse (Onychomys torridus) U
Usually found in desert scrub habitats.
Hispid cotton rat (Sigmodon hispidus) LC
Occurs in dense growth along the Colorado River and in agricultural areas.
Arizona cotton rat (Sigmodon arizonae) LC
Occurs along the Colorado River north of Ehrenberg, Arizona.
White-throated woodrat (Neotoma albigula) C
This woodrat often builds its house under cholla or prickly pear cactus.
Desert woodrat (Neotoma lepida) C
This woodrat is found in desert scrub habitats west of the Colorado River in California.
Muskrat (Ondatra zibethicus) C
This furbearer lives along the lower Colorado River in bank burrows with underwater entrances.
Porcupine (Erethizon dorsatum) B
Occurs in mesquite thickets and cottonwood woodlands and occasionally in desert scrub habitats.


Carnivores

Coyote (Canis latrans) C
A highly adaptable animal, the coyote is widespread throughout the western United States.
Kit fox (Vulpes macrotis) U
A shy, nocturnal desert dweller, the kit fox is sometimes seen in early morning sitting on the mound of soil at its den.
Gray fox (Urocyon cinereoargenteus) LC
Occurs in desert washes, on brushy hillsides, and along the lower Colorado River. Primarily nocturnal, it may also be active in early morning or early evening.
Raccoon (Procyon lotor) C
Usually occurs along the lower Colorado River
Ringtail (Bassariscus astutus) LC
A close relative of the raccoon, ringtails occupy rocky canyons and slopes and sometimes buildings.
Badger (Taxidea taxus) U
Most common on desert flats and fans near mountains.
Spotted skunk (Spilogale gracilis) U
Smaller than other skunks, this species is also faster and more agile. Prefers brushy areas near water.
Striped skunk (Mephitis mephitis) C
Most common near water and thickets of riparian vegetation, this skunk also frequents campgrounds in search of food scraps.
River otter (Lutra canadensis) R
Although presumed to be extirpated from the lower Colorado River, there are/have been occasional unconfirmed sightings of river otters in the area.
Mountain lion (Felis concolor) R
Desert populations of lions are low; sightings occur in the field office every two or three years.
Bobcat (Felis rufus) C
Bobcats occur in almost all habitat types, but are rarely seen because of their nocturnal habits.


Ungulates

Collared peccary (Tayassu tajacu) U
The collared peccary or javelina live in herds in desertscrub habitat. Occasionally seen in eastern mountain ranges within the field office boundaries, it is also expanding along the Gila and Colorado Rivers.
Mule deer (Odocoileus hemionus) C
Found in all except the southern-most part of the field office, mule deer populations are highest near permanent water.
Pronghorn (Antilocapra americana) R
The endangered Sonoran pronghorn occurs in small numbers south of Interstate 8 in southwestern Arizona.
Bighorn sheep (Ovis canadensis) LC
Drastically reduced in number from historic levels, bighorn sheep populations are rebounding in the Southwest due to an aggressive transplant and habitat management program. Found in most major mountain ranges.


Exotics

House mouse (Mus musculus) U
Introduced from Europe and Asia, the house mouse lives in agricultural areas, in and around houses and other buildings, and near communities.
Horse (Equus caballus) LC
Several bands of wild horses occur near the Colorado River and along U.S. Highway 95. They are descendents of early pioneer stock and escapees from modern day ranches.
Burro (Equus asinus) LC
Wild burros were first introduced with European settlement and have become successful inhabitants of arid habitats.

This resource is based on the following source:
Bureau of Land Management.  No date.  Mammals of the Yuma Field Office
     Arizona. Bureau of Land Management.  Unpaginated.
This resource should be cited as:
Bureau of Land Management.  No date.  Mammals of the Yuma Field Office
     Arizona. Bureau of Land Management.  Unpaginated.  
     Jamestown, ND: Northern Prairie Wildlife Research Center Online.
     http://www.npwrc.usgs.govyumamamm.htm    
     (Version 30DEC2002).

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