Oregon Department of Fish and Wildlife
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last updated: 02/20/2013
 
Oregon Species

Oregon Wildlife Species

Mammal Species of Oregon - Bats

Opossum | Shrews, Moles, and Shrew-moles | Bats | Pikas, Rabbits and Hares | Mountain beaver | Squirrels, Chipmunks, and Marmots | Pocket Gophers | Pocket Mice, Kangaroo Rats and Kangaroo Mouse | Beavers | Rats, Mice, Voles, Muskrats | Porcupines | Coyotes, Wolves and Foxes | Bears | Seals and Sea Lions | Ringtails and Raccoons | Weasels, Badgers, Otters and Skunks | Cats | Hoofed Mammals | Whales, Dolphins and Porpoises
Order Chiroptera
Bats - Families Vespertilionidae and Molossidae
California Myotis
California Myotis
-Photo by Michael Durham-

California Myotis Myotis californicus

California myotis is an acrobatic flyer. It is dark brown to blond with dark ears. It eats moths and flies.

Early in the summer, a female joins a maternity or nursery colony where she gives birth to one offspring.

In winter, these bats roost in mines, caves and buildings. All Oregon’s bats eat only insects.

In Oregon the California Myotis bat is found throughout the state except for the Columbia Basin.

Western Small-footed Myotis
Western Small-footed Myotis
-Photo by Michael Durham-

Western Small-footed Myotis Myotis ciliolabrum

The Western Small-footed Myotis is among the smaller bats in Oregon and is brown to pale yellow with black ears and a black mask across its eyes and nose.

It lives in dry climates, especially cliffs and rocks, and forages back and forth along the face of cliffs. It hibernates in caves and mines from November through February.

In Oregon, the species only occurs east of the Cascade Range.

Western long-eared myotis
Western long-eared myotis
-Photo by Michael Durham-

Western Long-eared Myotis Myotis evotis

The long-eared myotis is pale brown to strawberry. It is a slow flier and hovers around trees and rocks to catch flies, moths and wasps.

It is primarily a bat of coniferous forests in much of Oregon but may occur far from trees in shrub-steppe regions of the state. It forages in openings in dense forest, between the trees beneath the canopy in ponderosa pine, and over willow-bordered creeks. The species is known to enter dwellings and other buildings through open windows and doors, and to forage on moths therein.

The Long-eared Myotis often day roosts in buildings, but may use many other natural and man-made structures including caves and mines, bridges, hollow trees and loose bark on trees, and fissures in rock outcrops. In Oregon the Western Long-eared Myotis is found throughout the state.

Little Brown Bat
Little Brown Bat
-Photo by Michael Durham-

Little Brown Bat Myotis lucifugus

This bat is commonly found in attics and buildings during summer months in maternity colonies. It weighs about half an ounce and has a wingspan of 9 to 11 inches. It prefers to live in forests near water.

One baby is born in spring or summer. In winter, this bat hibernates in caves.

The little brown bat occurs throughout Oregon in a wide variety of habitats, but seems especially prone to establish residence near a lake, pond, or stream.

Fringed Myotis
Fringed Myotis
-Photo by Michael Durham-

Fringed Myotis Myotis thysanodes

This bat is brown to reddish brown and has relatively long forearms. It gets its name from the fringe of hairs along the bottom of its tail.

It roosts in trees, snags, buildings, caves, rocks, cliffs and bridges. It likes beetles and moths but will eat spiders and crickets.

The Fringed Myotis occurs in the Coast Range from Jackson County to Clatsop County and in the northeastern corner of the state.

Long-legged Myotis
Long-legged Myotis
-Photo by Michael Durham-

Long-legged Myotis Myotis volans

The long-legged bat lives in forests and comes out early in the evening to hunt. It is a fast flier and will chase insects for a long distance.

One baby is born in the summer, and the species hibernates in winter.

In general, the Long-legged Myotis is a species associated with Montane coniferous forests, but it also occurs in some desert and riparian habitats.

Yuma Myotis
Yuma Myotis
-Photo by Michael Durham-

Yuma Myotis Myotis yumanensis

Yuma myotis emerges when it is almost dark and forages for insects over streams and ponds. This bat is gray, tan or brown; it lives in a variety of habitats.

Large numbers of female bats gather together in May or June to have their young. In autumn, they migrate.

In Oregon, the Yuma Myotis is found throughout the state and is associated more closely with water than any other North American species of bat.

Gray Owl
Hoary Bat
-Photo by Michael Durham-

Hoary Bat Lasiurus cinereus

The hoary bat has a wingspan of nearly 16 inches. It has dark fur tipped with white, a dark mask on its face, a yellow-orange throat and round ears edged in black.

This bat roosts in branches of trees and likes to feed around outdoor lights. Hoary bats migrate south in winter, returning to Oregon in the spring. This bat usually bears twins.

In Oregon, Hoary Bats are found at scattered localities over most of the region west of the Cascade Range and in montane regions east of the Cascade Range.

Silver-haired bat
Silver-haired Bat
-Photo by Michael Durham-

Silver-haired Bat Lasionycteris noctivagans

This bat, found in older forests, has a wingspan of about 10 inches. Its fur is glossy black, tipped with white. It forages over ponds, streams, meadows and roads, often flying very low and roosting behind loose tree bark.

Maternity roosts of the silver-haired bat are found in trees. This bat usually bears twins.

The Silver-haired Bat occurs statewide in Oregon except for most of the Columbia Basin. It is primarily associated with coniferous forests, including the juniper woodlands in the southeastern portion of the state. It sometimes occurs in mixed deciduous-coniferous forest, and during migrations in May and September it occurs in rangelands where it forages along small streams.

Canyon Bat
Canyon Bat
-Photo by Michael Durham-

Canyon Bat Parastrellus hesperus

This species weighs less than one quarter of an ounce! Its fur is pale yellow to brownish gray with a dark face mask.

It likes rocky canyons and outcrops and flies early in the evening when it feeds on swarms of flying insects.

They Canyon Bat is found in Eastern Oregon.

Big Brown Bat
Big Brown Bat
-Photo by Michael Durham-

Big Brown Bat Eptesicus fuscus

This is a relatively large bat, with a wingspan of 13 to 14 inches. Its dark color and slow flight help with identification.

It is more likely to be active in cold weather than other bats, and prefers human structures for roosting.

In Oregon the Big Brown Bat occurs throughout the state. In eastern Oregon this bat forages over the forest canopy, along roads through the trees, along the forest edge, over forest clearings, and along cliffs and canyon streams. In western Oregon, the species is usually associated with coniferous and deciduous forests.

Spotted Bat
Spotted Bat
-Photo by Michael Durham-

Spotted Bat Euderma maculatum

Spotted bats are rare in North America.

They are white underneath with dark fur on their back and with large white spots.

They live in dry climates and often roost on high cliffs.

The Spotted Bat is found in Eastern Oregon.

Townsend's Big-eared Bat
Townsend's Big-eared Bat
-Photo by Michael Durham-

Townsend's Big-eared Bat Corynorhinus townsendii

This is a medium-sized bat with large, long ears. It is gray, brown, or black. It is generally active only after full darkness.

This species is very vulnerable to human disturbance and its numbers are declining. In Oregon, it is classified as a State Sensitive Species. Never disturb this bat if you are in a cave.

It is found throughout much of Oregon.

Pallid Bat

Pallid Bat
-Photo by Michael Durham-

Pallid Bat Antrozous pallidus

This is a large, pale bat with huge ears, large eyes and a dog-like face. Its wing beat is slower than most bats.

It emerges late at night to feed primarily on the ground, eating large beetles, crickets, and even scorpions. Pallid bats can walk on the ground and are immune to a scorpion’s sting.

The pallid bat is uncommon and is found mostly in arid regions in canyons. It is found in Southwestern and Eastern Oregon.

Pallid Bat

Brazilian Free-tailed Bat
-Photo by Michael Durham-

Brazilian Free-tailed Bat Tadarida brasiliensis

This is a fast-flying, medium-small bat with long narrow wings and a tail.

It survives the cold winters in Oregon by staying in heated buildings instead of hibernating or migrating, often sharing these quarters with other bat species.

Roseburg may be the most northern part of this bat’s range.


Oregon Department of Fish and Wildlife
4034 Fairview Industrial Dr. S.E.   ::   Salem, OR 97302   ::    Main Phone (503) 947-6000 or (800) 720-ODFW   ::   www.dfw.state.or.us

Questions?
Contact odfw.web@state.or.us