The mammal collection was initiated by David Hurst Thomas as part of the Harvard-Nevada expedition in the mid-late 1960s.
Since that time it has grown in an ad-hoc manner with specimens added by graduate students (e.g., William Hildebrandt) as part of their dissertation research. After 2001, Christyann Darwent has focused on increasing the number of complete specimens from California, and after 2006, Teresa Steele has increased the number of European species. The collection now houses a total of 438 specimens representing 84 different species of mammal.
| ORDER | FAMILY | GENUS | SPECIES | COMMON NAME | LOCALITY | OSTEOLOGICAL SPECIMAN | UNPROCESSED (FREEZER) | PORTION |
|---|---|---|---|---|---|---|---|---|
| Artiodactyla | Antilocapridae | Antilocapra | americana | pronghorn antelope | CA/NV | 7 | 3 skulls, 1 post-cranium, 3 incomplete post-cranium | |
| Artiodactyla | Bovidae | Bison | bison | bison | UT | 1 | post-cranium | |
| Artiodactyla | Bovidae | Bos | taurus | cow (domestic) | CA/NV (non-native) | 4 | 2 skulls, 2 complete | |
| Artiodactyla | Bovidae | Capra | hircus | goat (domestic) | CA/MX (non-native) | 5 | 4 skulls, 1 incomplete post-cranium | |
| Artiodactyla | Bovidae | Ovis | aries | sheep (domestic) | CA (non-native) | 11 | 1 | 11 skulls, 1 complete, 1 incomplete post-cranium |
| Artiodactyla | Bovidae | Ovis | canadensis | bighorn/ desert sheep | NV/UT | 14 | 7 skulls, 8 incomplete post-cranium | |
| Artiodactyla | Cervidae | Cervus | elaphus | red deer | UK | 2 | skull | |
| Artiodactyla | Cervidae | Cervus | elaphus roosevelti | Roosevelt's elk (wapiti) | WA | 1 | skull | |
| Artiodactyla | Cervidae | Odocoileus | hemionus | mule deer | CA/NV/UT | 22 | 16 skulls, 4 complete, 4 incomplete post-cranium | |
| Artiodactyla | Cervidae | Rangifer | tarandus | caribou | AK | 2 | 2 incomplete post-cranium | |
| Artiodactyla | Suidae | Sus | scrofa | pig (wild/ domestic) | CA (non-native) | 17 | 7 skulls, 1 complete, 9 partial post-cranium | |
| Carnivora | Bassariscidae | Bassariscus | astutus | ringtail | CA | 1 | incomplete | |
| Carnivora | Canidae | Canis | familiaris | dog | CA/Greenland | 19 | 10 skulls, 4 complete, 3 incomplete, 2 incomplete post-cranium | |
| Carnivora | Canidae | Canis | latrans | coyote | CA/NV | 12 | 7 skulls, 2 complete, 1 post-cranium, 1 incomplete post-cranium | |
| Carnivora | Canidae | Urocyon | cinereoargenteus | gray fox | CA/MX/NV | 8 | 5 skulls, 2 complete, 2 incomplete | |
| Carnivora | Canidae | Vulpes | lagopus | arctic fox | Greenland | 1 | skull | |
| Carnivora | Felidae | Felis | concolor | mountain lion | CA | 2 | 1 complete, 1 post-cranium | |
| Carnivora | Felidae | Felis | domesticus | cat (domestic) | CA | 3 | 1 skull, 2 complete | |
| Carnivora | Felidae | Lynx | rufus | bobcat | CA/NV | 10 | 1 | 5 skulls, 6 complete |
| Carnivora | Mustelidae | Enhydra | lutris | sea otter | AK (on loan) | 1 | complete | |
| Carnivora | Mustelidae | Lontra | canadensis | northern river otter | MO | 1 | skull | |
| Carnivora | Mustelidae | Mephitis | mephitis | striped skunk | CA | 5 | 3 skulls, 1 complete, 1 incomplete | |
| Carnivora | Mustelidae | Mustela | frenata | long-tailed weasel | CA | 4 | complete | |
| Carnivora | Mustelidae | Mustela | vison | mink | CA/NV | 3 | complete | |
| Carnivora | Mustelidae | Taxidea | taxus | badger | CA/NV | 3 | 1 skull, 2 complete | |
| Carnivora | Odobenidae | Odobenus | rosmarus | walrus | Greenland | 1 | skull | |
| Carnivora | Otariidae | Calorhinus | ursinus | northern fur seal | CA | 1 | complete (juvenile) | |
| Carnivora | Otariidae | Eumetopias | jubatus | Steller (northern) sea lion | CA | 2 | 1 skull, 1 post-cranium (female) | |
| Carnivora | Otariidae | Zalophus | californianus | California sea lion | CA | 3 | 2 | 1 skull, 3 complete, 1 post-cranium |
| Carnivora | Phocidae | Erignathus | barbatus | bearded seal | AK | 2 | skull | |
| Carnivora | Phocidae | Phoca | vitulina | harbor seal | CA | 2 | 1 | complete |
| Carnivora | Phocidae | Pusa | hispida | ringed seal | AK (on loan) | 1 | complete (juvenile) | |
| Carnivora | Procyonidae | Procyon | lotor | racoon | CA/NV | 6 | 2 skulls, 4 complete | |
| Carnivora | Ursidae | Ursus | americanus | black bear | CA | 4 | 1 skull, 1 complete, 2 post-cranium | |
| Carnivora | Ursidae | Ursus | arctos middendorffi | Alaskan brown bear | AK | 1 | skull | |
| Cetacea | Delphinidae | Delphinus | delphis | common dolphin | CA | 1 | skull | |
| Cetacea | Delphinidae | Stenella | attenuta (cf.) | dolphin (spotted?) | CA | 2 skulls, 1 incomplete post-cranium | ||
| Chiroptera | Vespertilionidae | Myotis | lucifugus | little brown bat | CA | 1 | complete | |
| Diprotodontia | Macropodidae | Macropus | fuliginosus | western grey kangaroo | Australia | 1 | skull | |
| Diprotodontia | Vombatidae | Vombatus | ursinus | coarse-haired wombat | Australia | 1 | skull | |
| Insectivora | Siricidae | Sorex | vagrans | vagrant shrew | CA | 2 | complete | |
| Insectivora | Talpidae | Scapanus | latimanus | broad-footed mole | CA | 1 | complete | |
| Insectivora | Tupaiidae | Tupaia | glis | tree shrew | CA (non-native) | 2 | complete | |
| Lagomorpha | Leporidae | Lepus | californicus | black-tailed jackrabbit | CA | 11 | 2 skulls, 9 complete | |
| Lagomorpha | Leporidae | Lepus | europaeus | European brown hare | UK | 1 | complete | |
| Lagomorpha | Leporidae | Lepus | townsendii | white-tailed jackrabbit | NV | 1 | complete | |
| Lagomorpha | Leporidae | Sylvilagus | audubonii | Audubon/desert cottontail | CA | 1 | complete | |
| Lagomorpha | Leporidae | Sylvilagus | nuttallii | Nuttall's cottontail | CA/NV | 4 | 3 complete, 1 incomplete post-cranium | |
| Lagomorpha | Leporidae | Sylvilagus | sp. | cottontail | CA | 1 | complete | |
| Marsupiala | Didelphidae | Didelphis | virginiana | opossum | CA | 3 | 2 skulls, 1 complete | |
| Perrissodactyla | Equidae | Equus | cabalus | horse | CA (non-native) | 3 | 2 skulls, 1 incomplete post-cranium | |
| Rodentia | Castoridae | Castor | canadensis | beaver | CA/NV | 2 | complete | |
| Rodentia | Cricetidae | Microtus | californicus | California meadow vole | CA | 110 | 105 skulls, 5 complete | |
| Rodentia | Cricetidae | Microtus | longicaudus | long-tailed vole | NV | 1 | complete | |
| Rodentia | Cricetidae | Microtus | montanus | mountain vole | NV | 1 | complete | |
| Rodentia | Cricetidae | Neotoma | cinerea | bushy-tailed woodrat | CA/NV | 3 | complete | |
| Rodentia | Cricetidae | Neotoma | lepida | desert woodrat | NV | 1 | complete | |
| Rodentia | Cricetidae | Ondatra | zibethicus | muskrat | CA/NV | 2 | complete | |
| Rodentia | Cricetidae | Onychomys | leucogaster | northern grasshopper mouse | CA | 2 | complete | |
| Rodentia | Cricetidae | Peromyscus | maniculatus | deer mouse | CA/NV | 17 | 4 skulls, 13 complete | |
| Rodentia | Cricetidae | Reithrodontomys | megalotis | western harvest mouse | CA | 1 | complete | |
| Rodentia | Erethizontidae | Erethizon | dorsatum | porcupine | CA | 4 | complete | |
| Rodentia | Geomyidae | Geomys | bursarius | plains pocket gopher | CA | 1 | incomplete | |
| Rodentia | Geomyidae | Marmota | flaviventris | yellow-bellied marmot | NV | 1 | complete | |
| Rodentia | Geomyidae | Thomomys | bottae | valley pocket gopher | CA | 22 | 28 skulls, 3 complete, 1 incomplete post-cranium | |
| Rodentia | Geomyidae | Thomomys | bottae | valley pocket gopher | CA | 1 | complete | |
| Rodentia | Geomyidae | Thomomys | talpoides | northern pocket gopher | CA/NV | 4 | complete | |
| Rodentia | Heteromyidae | Dipodomys | merriami | Merriam's kangaroo rat | NV | 1 | complete | |
| Rodentia | Heteromyidae | Dipodomys | microps | great basin kangaroo rat | NV | 2 | complete | |
| Rodentia | Heteromyidae | Dipodomys | ordii | Ord's kangaroo rat | CA/NV | 2 | complete | |
| Rodentia | Heteromyidae | Dipodomys | panamintinus | Panamint's kangaroo rat | NV | 1 | complete | |
| Rodentia | Heteromyidae | Perognathus | longimembris | little pocket mouse | NV | 1 | complete | |
| Rodentia | Muridae | Mus | musculus | house mouse | CA | 8 | 3 skulls, 5 complete | |
| Rodentia | Muridae | Rattus | norvegicus | Norway rat | CA (non-native) | 2 | complete | |
| Rodentia | Muridae | Rattus | rattus | black rat | CA (non-native) | 3 | complete | |
| Rodentia | Sciuridae | Ammospermophilus | leucurus | white-tailed antelope squirrel | NV | 1 | complete | |
| Rodentia | Sciuridae | Eutamias | minimus | least chipmunk | NV | 1 | complete | |
| Rodentia | Sciuridae | Eutamias | quadrivittadus | Colorado chipmunk | NV | 1 | complete | |
| Rodentia | Sciuridae | Sciurus | griseus | western grey squirrel | CA/NV | 8 | 1 skull, 7 complete | |
| Rodentia | Sciuridae | Spermophilus | beecheyi | California ground squirrel | CA | 7 | 3 skulls, 4 complete | |
| Rodentia | Sciuridae | Spermophilus | lateralis | golden-mantled ground squirrel | CA/NV | 3 | complete | |
| Rodentia | Sciuridae | Spermophilus | parryii | Arctic ground squirrel | AK | 1 | complete | |
| Rodentia | Sciuridae | Tamiasciurus | douglasii | douglas squirrel | CA | 1 | complete | |
| Rodentia | Sciuridae | Tamiasciurus | hudsonicus | American red squirrel | CA | 1 | complete |