The Yuma myotis is a small, insectivorous bat species found in the western United States, northern Mexico, and parts of Central America. Its fur is darker on the back with a lighter, pale underside. The Yuma myotis has small ears characteristic of myotis bats, which helps it detect and hunt insects using echolocation. This bat …
A small, insectivorous bat, western small-footed myotis range from pale tan to orange-yellow on the back, contrasting with paler fur on the undersides. The black face, ears, and flight membranes contrast strikingly with the paler overall color of the fur.
Western long-eared myotis are small bats with yellowish to darker brown fur, with brown patches on the shoulders and pale undersides. The ears are long with dark membranes that contrast the lighter fur. The flight membranes are also dark.
Sea otters are the smallest marine mammal species and live in the nearshore waters along the Pacific Coast of North America, Russia, and Japan. They are members of the Mustelidae family, which also includes weasels, badgers, and wolverines. Their historic range stretched from Hokkaido, Japan around the North Pacific Rim to Baja, Mexico. The population …
The North American porcupine is a large, short-legged rodent with up to 30,000 barb-tipped quills (modified hairs) covering the upper parts of the body and the dorsal and lateral surfaces of the tail. The quills are scattered among much longer, coarse guard hairs; the underfur is woolly. The quills are arranged in rows across the …
The little brown bat is a small insectivorous bat found throughout Oregon in a variety of habitats types. They have variably-colored, long, glossy fur and small eyes and ears. They are similar in appearance to Yuma myotis. These bats are nocturnal and use echolocation to hunt insects such as mosquitoes and moths.
Humpback whales can grow up to about 60 feet long, weigh about 40 tons, and may live up to 90 years. They have a dorsal fin, very long pectoral fins that can reach about 15 feet long, and their flukes have unique patterns of color and scalloped trailing edges for each individual. The upper jaw …
The canyon bat (known formerly as the as the western pipistrelle) is a small, insectivorous bat that roosts in crevices in rock faces, caves, mines, and possibly cracks or rodent holes found amongst rocks and boulder fields. The species is thought to be non-migratory.
The Pacific marten is a medium-sized carnivorous mammal belonging to the weasel family (Mustelidae). Martens are characterized by the long and narrow body type typical of the mustelid family. They have brown fur with distinctive coloration on the throat and upper chest that varies from orange to yellow to cream, large and distinctly triangular ears, …
The silver-haired bat is a small vespertilionid, with adults ranging from 92-115 mm in length, weighing 8.1 to 11 g with a tragus length of 5-9 mm. Their distinctive fur coloration, consisting of silvery or frosted hairs, makes them unlikely to be confused with other bat species in Oregon. Their interfemoral membrane is furred above …
The American pika is a small lagomorph typically confined to rocky habitats usually in higher elevation areas. The American pika has a discontinuous patchy distribution in mountainous areas of Oregon and western North America, primarily within the Great Basin, Cascade Range, and Rocky Mountain Range. American pikas are overall stout and rounded, with short legs …
The spotted bat is one of the most distinctive bats in North America due to its coloration, pelage, and large ears. Their unique fur coloration consists of a striking black and white pattern along with large pinkish-red ears; the white spots are about 15 mm in diameter and are found at the base of each …
The California myotis is one of the smallest insectivorous bats in the United States; adults weigh 3-5 grams and a have wingspan of 22-23 cm. The hind feet of California myotis are small with a prominently keeled calcar. Their fur is relatively long and dull, ranging in color from dark brown in the Pacific Northwest …
Townsend’s big-eared bat is a medium sized bat (5-13g) with large ears joined at their base, and large horseshoe-shaped glands on its muzzle. The dorsal hair color has a grey base, and the tips range from pale cinnamon to blackish brown. The ventral hairs are also grey at the base, but the tips range from …
The Columbian white-tailed deer is the smallest member of the cervidae family in Oregon. The most distinguishing feature of this deer is its long, wide tail , brown on top with a white underside, that can easily be seen when the deer is startled. In males, antlers with tines typically arise from a single main …
Washington ground squirrels are small squirrels with pale, smokey gray pelage and a black tip to the tail, distinguished from other ground squirrels by their small size and distict white dorsal spotting. The Washington ground squirrel is endemic to the Columbia Plateau in Oregon and Washington.The species’ life cycle is characterized by a relatively short …
The Pacific fisher is a medium-sized carnivorous mammal in the Mustelidae (weasel) family, native to the dense forests of the Pacific Northwest in North America. In Oregon, they are found primarily in southern Oregon in the Klamath and Cascade Mountains. The pelage is long except on the face. The fur is dark brown grading to …
The western gray squirrel is the largest native tree squirrel in its range, with adults measuring 500 – 615 mm in length and weighing 520 – 942 g. Tail length ranges from 240 – 309 cm.The dorsal side of body is a silvery-gray with white-tipped hairs, and the ventral side is white. The tail is …
The fringed myotis is a long-eared vesper bat or “evening bat,” with long, dark ears, dark brown wings, and a dark muzzle. The dorsal fur ranges from yellow to copper to dark brown and olive, with the base of the hairs being very dark. This species gets its name thanks to its set of small …
The wolverine is the largest terrestrial member of the weasel family (Mustelidae). It is often described as bear-like due to its mostly dark brown coloring, thick body, short ears, and broad head. Wolverines are a sexually dimorphic, mid-size carnivore with males weighing 10 to 18 kg and females 7 to 13 kg. The average length …
Gray wolves are the largest canid species in the world. Only about half of gray wolves are actually grey; the rest can be anywhere from white to jet black. Gray wolves can be distinguished from coyotes by their longer legs, shorter ears, straight tail, larger feet, and wider head and snout. Wolf howls are longer …
The white-tailed jackrabbit is a species of hare found throughout western North America. White-tailed jackrabbits have a brown to grayish-brown summer coat that, in northern populations, transitions to an almost pure white coat in the winter to provide camouflage in the snow. They are leaner than most other hares and rabbits. Their large ears, which …
The hoary bat is a large, migratory bat species. Their fur is dense and long, with a distinct silver-gray appearance on their backs and a pale, lighter underside, which gives them their “hoary” (frosted) look. These bats are solitary and nocturnal, feeding primarily on insects like moths, beetles, and flies, which they catch in flight. …
The gray whale is a baleen whale that can reach lengths of 40 to 50 feet, weigh up to 80,000 pounds, and can live up to approximately 80 years. They do not have a dorsal fin, only a dorsal ridge that looks like knuckles on its back. Gray whale bodies are covered with rough patches …
The kit fox is a small canid native to desert regions of the western United States and parts of northern Mexico. In Oregon, it is at the northernmost part of its range and found in Harney and Malheur counties. Kit foxes have the largest ears relative to body size of any canid in North America. …
Harbor porpoise are among the smallest of marine mammals. They have a small robust body that is dark grey on the upper half and white on the bottom half. They have a blunt rounded head with a grey “chinstrap”. The most distinguishing feature of harbor porpoises as they surface, is their short triangular dorsal fin. …
The long-legged myotis is named for its slightly longer tibia in relation to other myotis species. It is distinguished from other member of its genus by its short, rounded ears, small hind feet, a distinctly keeled calcar, fur on the underwing membranes, and general size. Total length ranges from 83 to 106 mm, tail length …
Northern elephant seals are the second largest pinniped in the world. Males are usually between 13 and 16 feet long and weigh between 3,300 and 5,100 pounds. Males develop an inflatable nose (proboscis) resembling a trunk that hangs down below their mouth. Females are smaller and are usually 10 to 13 feet in length and …
The pallid bat is a relatively large bat species found primarily in the southwestern United States and parts of Mexico. In Oregon, they are found east of the Cascades, though they are historically known to have occurred in the Willamette Valley. They are gregarious, often found roosting with social groups of 20 or more individuals. …
Killer whales have unique black and white marking and dorsal fins on each individual. They can grow up to 32 feet in length and weigh up to approximately 11 tons. They exhibit sexual dimorphism, with males considerably larger than females. They can live somewhere between 30 and 90 years.
The pygmy rabbit is the smallest rabbit species in North America, with adults weighing an average of 400 g. The female is somewhat larger than the male. Fur is color is gray, but lighter in autumn and winter than in spring and summer; hairs are banded with blackish tips, buff-colored mid-shafts, and dark gray at …
The red tree vole is a small rodent native to the wet coniferous forests of the Pacific Northwest, found in western Oregon and northwestern California. The red tree vole is arboreal, spending nearly its entire life in the forest canopy, where it feeds on the needles and bark of conifer trees, particularly Douglas fir. Red …
Ringtails are an elusive, nocturnal mammal in the raccoon (Procyonidae) family that are about the size of a small house cat, weighing 2-2.5 pounds. They are slender with a long body and a tail about head-body length. The tail is ringed with eight dark bands, including the tip, alternating with seven pale bands. Ringtails have …
Rocky Mountain bighorn sheep are the largest-bodied bighorn in North America and one of two subspecies of wild sheep in Oregon. The bighorn sheep is a medium-sized, largely brownish bovid in the Caprinae subfamily with a white rump patch, muzzle, abdomen, and rear portion of the legs. The tail is blackish brown on the exposed …
The Sierra Nevada red fox is a montane subspecies of red fox. Red foxes are small canids with slender bodies, elongated snouts, large, pointed ears, and large, bushy tails with a white tip. There are at least three color morphs: red morph animals have a yellowish-reddish brown upper body and tail, white cheeks, throat, and …