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Mammal Species List


The following tables should not be considered a definitive list of the vertebrate species occurring on the INL. Although all of the abundant and common species should be included, some of the less commonly occurring species may have been missed. Not all habitats on the INL have been surveyed with the same intensity. Therefore, the number of vertebrate species observed on the INL is likely to increase as field efforts in some of the lesser studied habitats intensify.

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Definition of terms used for seasonal used categories are:

  • Resident - occurs on the INL through the year
  • Migrant - occurs on the INL only during migration
  • Summer - occurs on the INL during summer
  • Winter - occurs on the INL during winter

Definition of terms used for abundance on the INL are:

  • Abundant - very numerous and certain to be seen or sampled
  • Common - likely to be observed or sampled
  • Uncommon - occurs in limited numbers and is not likely to be observed or sampled
  • Local - a species that is not always present or is restricted in distribution
  • Rare - a species that has the INL as part of its range, but occurs very infrequently
  • Accidental - a species that is not expected to be found in the INL area, but has been recorded

Vertebrates were classified according to the following habitats:

  • Aquatic - on or near water
  • Juniper foothills
  • Riparian zones
  • Sagebrush/grassland
  • Sitewide
  • Irrigated lawns near facilities
  • Agricultural areas
Species Distribution Seasonal Occurrence Abundance Remarks
Order INSECTIVORA
Family Soricidae
Merriam Shrew 
(Sorex merriami)
Sitewide Resident Uncommon  
Order CHIROPTERA
Family Vespertilionidae
California Myotis
(Myotis californicus)
Sitewide Unknown Unknown  
Little Brown Myotis
(Myotis lucifugus)
Sitewide Unknown Unknown
Townsend's Big-eared Bat
(Corynorhinus townsendii)
Sitewide Unknown Unknown  
Order LAGOMORPHA
Family Leporidae
White-tailed Jack Rabbit
(Lepus townsendii)
Sitewide Resident Uncommon  
Black-tailed Jack Rabbit
(Lepus californicus)
Sitewide Resident Abundant Cyclic population
Mountain Cottontail
(Sylvilagus nattallii)
Sitewide Resident Abundant  
Pygmy Rabbit
(Brachylagus idahoensis)
Sagebrush/Grassland Resident Abundant  
Order RODENTIA
Family Sciuridae
Yellow-bellied Marmot
(Marmota flaviventris)
Sitewide Resident Uncommon Rocky areas
Townsend's Ground Squirrel
(Spermophilus townsendi)
Sitewide Resident Common Estivates - likely to be observed only in April-June
Least Chipmunk
(Tamias minimus)
Sitewide Resident Common  
Family Geomyidae
Northern Pocket Gopher
(Thomomys talpoides)
Sitewide Resident Uncommon  
Family Heteromyidae
Great Basin Pocket Mouse
(Perognathus parvus)
Sitewide Resident Common  
Ord's Kangaroo Rat
((Dipodomys ordii)
Sitewide Resident Common  
Family Castoridae
Beaver
(Castor canadensis
Aquatic Summer
Winter
Uncommon
Uncommon
 
Family Cricetidae
Western Harvest Mouse
(Reithrodontomys megalotis)
Sitewide Resident Common  
Deer Mouse
(Peromyscus maniculatus))
Sitewide Resident Abundant  
Northern Grasshopper Mouse
(Onychomys leucogaster)
Sitewide Resident Uncommon  
Bushy-tailed Woodrat
(Neotoma cinerea)
Sitewide Resident Common Basalt outcroppings
Meadow Vole
(Microtus pennsylvanicus)
Sitewide Resident Uncommon Cyclic
Montane Vole
(Microtus montanus)
Sitewide Resident Common Cyclic
Sagebrush Vole
(Lagurus curtatus)
Sitewide Resident Uncommon  
Muskrat
(Ondatra zibethicus)
Aquatic Summer
Winter
Uncommon
Uncommon
 
Family Muridae
Norway Rat
(Rattus norvegicus)
Agricultural Resident Uncommon  
House Mouse
(Mus musculus)
Agricultural
Facilities
Resident Uncommon  
Family Erythizontidae
Porcupine
(Erethizon dorsatum)
Riperian
Summer
Winter
Uncommon
Uncommon
 
Order CARNIVORA
Family Canidae
Coyote
(Canis latrans)
Sitewide Resident Common
Family Mustelidae
Long-tailed Weasel
(Mustela frenata)
Sitewide Resident Common
Badger
(Taxidea taxus)
Sitewide Resident Common
Spotted Skunk
(Spilogale gracilis)
Sitewide Resident Uncommon Usually near basalt outcroppings
Family Felidae
Mountain Lion
(Felis concolor)
Sitewide Transient1 Rare
Bobcat
((Lynx rufus)2
Sitewide Resident Uncommon
Order ARTIODACYLA
Family Cervidae
Elk
(Cervus elaphus)
Sitewide Resident Common
Mule Deer
(Odocoileus hemionus)
Sitewide Resident Uncommon
Moose
(Alces alces)
Sitewide Transient2 Rare
Family Antilocapridae
Pronghorn (Antilocapra americana) Sitewide Resident Abundant
Family Bovidae
Mountain Sheep (Ovis canadensis) Sagebrush/Grassland Unknown Accidental Only reported from northern portion of the INL Site.

POSSIBLE OCCURRENCE

Order CHIROPTERA
Family Vespertilionidae
Small-footed Myotis (Myotis subulatus) Sitewide      
Yuma Myotis(Mytois yumanensis) Sitewide      
Long-legged Myotis (Myotis volans) Sitewide      
Fringed Myotis (Mytois thysanodes) Sitewide      
Long-eared Myotis (Myotis evotis) Sitewide      
Silver-haired Bat (Lasionycteris noctivagans) Sitewide      
Western Pipistrel (Pipistrellus hesperus) Sitewide      
Big Brown Bat (Eptesicus fascus) Sitewide      
Hoary Bat (Nycteris cinerea) Sitewide      
Pallid Bat (Antrozous pallidus) Sitewide      
Order CARNIVORA
Family Procyonidae
Racoon (Procyon lotor) Agricultural / Riperian      
Family Mustelidae
Short-tailed Weasel (Ermine) (Mustela erminea) Agricultural / Riperian      
Striped Skunk (Mephitis mephitis) Agricultural / Riperian    
Family Canidae
Red Fox (Vulpes vulpes) Agricultural / Riperian      
1Occurs on the INL for a relatively short time, usually during seasonal migration or dispersal
2Jones et al. (1979) list this species as Felis rufus

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