Photo: Stuart Allen's Lake Berryessa Line

The Putah-Cache Bioregion Project:

Mammals of Lower Putah and Cache Creeks

Yolo County, California

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Compiled by Melanie Allen Truan (Putah Cache Bioregion Project) and Ron Cole (Museum of Wildlife & Fisheries Biology), UC Davis, from museum records and from field work conducted along lower Putah and Cache Creeks, 1997-1999


Family Didelphidae
Opossum (Didelphis virginiana) - common


Family Soricidae
Ornate Shrew (Sorex ornatus) - rare
Family Talpidae
Broad-handed Mole (Scapanus latimanus) - rare


The following species are known to be present in this area from a few days to a few weeks during the year. Peak times for bats are in the spring and fall, when many of these species are migrating from southern coastal to northern mountainous areas.

Family Vespertilionidae
Pallid Bat (Antrozous pallidus)
Big Brown Bat (Eptesicus fuscus)
Silvery-haired Bat (Lasionycteris noctivagens)
Red Bat (Lasiurus borealis)
Hoary Bat (Lasiurus cinereus)
Myotis (Myotis spp.)
Western Pipistrelle (Pipistrellus hesperus)
Lump-nosed Bat (Plecotus townsendii)
Family Molossidae
Brazilian Free-tailed Bat (Tadarida brasiliensis)


Family Leporidae
Blacktail Jackrabbit (Lepus californicus) - abundant
Audubon's Cottontail (Sylvilagus audubonii) - common
Domestic Rabbit (Oryctolagus cuniculus) - rare


Family Sciuridae
California Ground Squirrel (Spermophilus beecheyi) - abundant
Western Gray Squirrel (Sciurus griseus) - common
Family Geomyidae
Botta's Pocket Gopher (Thomomys bottae) - abundant
Family Castoridae
Beaver (Castor canadensis) - common
Family Muridae
Western Harvest Mouse (Reithrodontomys megalotis) - uncommon
Deer Mouse (Peromyscus maniculatus) - uncommon
Dusky-footed Woodrat (Neotoma fuscipes) - rare in Valley, common toward Coast Range
California Vole (Microtus californicus) - common
Muskrat (Ondatra zibethica) - common
Norway Rat (Rattus norvegicus) - uncommon
Black Rat (Rattus rattus) - common
House Mouse (Mus musculus) - common, locally abundant


Family Ursidae
Black bear (Ursus americanus) - one individual at Pedrick Rd., spring 1998
Family Procyonidae
Raccoon (Procyon lotor) - common
Ringtail (Bassariscus astutus) - uncommon
Family Mustelidae
Long-tailed Weasel (Mustela frenata) - status unknown
River Otter (Lutra canadensis) - common, population likely increasing
Mink (Mustela vison) - uncommon resident
Striped Skunk (Mephitus mephitus) - uncommon resident
Spotted Skunk (Spilogale putorius) - uncommon resident, population
appears to have declined in recent years
Family Canidae
Coyote (Canis latrans) - common
Red fox (Vulpes fulva) - uncommon resident, introduced
Gray fox (Urocyon cinereoargenteus) - uncommon resident, populations may be increasing
Domestic Dog (Canis lupus familiaris) - common
Family Felidae
Mountain Lion (Felis concolor) - two individuals on campus, 1990-91, 1998
Bobcat (Lynx rufus) - rare
Domestic House Cat (Felis silvestris) - common


Family Cervidae
Blacktail Deer (Odocoileus hemionus) - uncommon in Valley, but likely increasing; common toward Coast Range

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