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Didelphidae Didelphis virginiana
5/4 incisors

Ochotonidae Ochotona princeps
American pika
2/1 incisors, peg-like second upper incisor
no supraorbital process

Leporidae Lepus californicus
Black-tailed jackrabbit
fan-shaped supraorbital process

Leporidae Sylvilagus bachmani
Brush rabbit
narrow, strap-like supraorbital process

Aplodontiidae Aplodontia rufa
mountain beaver
protogomorphous
acorn shaped teeth

Sciuridae Marmota flaviventris
yellow-bellied marmot
depression in nasal bone


Sciuridae Glaucomys oregonensis
Humboldt Flying Squirrel
pterygoids touch auditory bulla

Sciuridae Tamiasciurus douglasii
Douglas Squirrel
4 cheek teeth

Sciuridae Hesperosciurus griseus
Western Grey Squirrel
5 cheek teeth

Sciuridae Neotamias sp.
chipmunks
hard: round hole in zygomatic plate
soft: furred stripes through the eye

Sciuridae Otospermophilus douglasii
Douglas ground squirrel
V-shaped temporal ridge S

Sciuridae Callospermophilus lateralis
golden-mantled ground squirrel
U-shaped temporal ridge

Castoridae Castor canadensis
North American beaver
depression in the basioccipital bone

Geomyidae Thomomys bottae
pocket gopher
myomorphic
IFO doesn’t pierce the rostrum

Heteromyidae Perognathus sp.
pocket mice
auditory bulla meet anteriorly

Heteromyidae Dipodomys sp.
kangaroo rat
auditory bullae expand laterally beyond zygomatic arches

Zapodidae Zapus trinotatus
Pacific Jumping Mouse
hystricomorphic
4 upper cheek teeth
