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The Eastern gray squirrel is the smallest member of the genus in Oregon. This squirrel was introduced into Oregon and can now be found in Salem, Portland, Milwaukie, and Vale. All populations in Oregon have been found in urban areas. This squirrel is active throughout the year, activity restricted to daylight hours. Photo from Washington Fish and Wildlife

The Wyoming ground squirrel is a medium-sized ground squirrel without spots, stripes, or splotches. The dorsal pelage is grayish with a slight buffy wash. In the field, it appears distinctly more yellowish than other ground squirrels that it might be confused with. The tail is usually longer, as well. This ground squirrel is found in southeastern Oregon and emerges from hibernacula in the spring and by late July has again entered torpor. During the active season, individuals usually become active within an hour after sunrise. Photo by Andrew Hoffman, Flickr

The Douglas' squirrel is one of the smaller tree squirrels in Oregon. The color and markings of this squirrel differ individually, geographically and seasonally, appearing a dusky olive to brownish gray with an indistinct band of reddish brown with a blackish band along the flanks. In Oregon, it occurs in coniferous forests from the Pacific coast to as far east as western Baker County. Douglas' squirrels are active during the daylight hours year-round, although they may remain in their nests or tree dens for a day or two during inclement weather. Photo by Kathy Munsel, ODFW

These large toads have bumps on their dry skin which contain poison glands to discourage predators. Color varies between individuals ranging from gray or yellow to dark brown. They have thin white stripes along their backs and yellow bellies with dark specks. Females are larger than males and grow to five inches in length. Woodhouse’s toads live in river valleys in sagebrush and grassland habitats. They rest in burrows throughout the daytime hours and use wetlands during the breeding season. During dry weather, they burrow underground. Photo by Cameron Sponseller

The bright rusty plumage of the male cinnamon teal, a bird of western North America, is a visual delight. In flight, both males and females show powder blue in the wings as they fly fast and low, timed at nearly 60 miles per hour. They weigh only about one pound. They are a common breeder throughout the state except in western Oregon and the high Cascades. They are most common east of the Cascades. Hear the call of the cinnamon teal Photo by Maxine Wyatt

The heather vole is among the smaller voles in Oregon. In appearance, it strongly resembles the montane vole. It is gray to brownish on the dorsum, whitish to grayish on the venter. Two of nine nominal subspecies are purported to occur in Oregon: the lighter colored P. I. intermedius in the Blue and Wallowa mountains of northeastern Oregon and the darker P. I. oramontis in the Cascade Range. Heather voles are rather docile creatures; they usually make little attempt to flee or to defend themselves when captured. It is active during daylight hours more frequently than the Southern red-backed vole…

In Oregon, the opossum is considered an invasive species. The Virginia opossum is a cat-sized mammal with a pointed nose, unfurred, black, leathery ears with white edges; beady eyes; a hind foot with an opposable hallux (big toe); and a naked scaly tail. It was introduced in Oregon between 1910 and 1921. Populations were established in northwestern Oregon apparently from releases of animals brought to the state as pets or novelties. Small streams, forest communities, and agricultural lands planted to a variety of crops are typical of many habitats occupied by Virginia opossums in Oregon. They are active nocturnally and…

This seabird, the most abundant in Oregon, has recently suffered severe declines or significant population shift in the eastern North Pacific. Similar in shape to thin, long-winged gulls, sooty shearwaters are dark sooty gray with limited amounts of white on the underwing coverts. They glide on wind currents along wave troughs on stiff wings. Gregarious, they form huge loose flocks in migration, often passing for hours within site of land-based observers. In Oregon, it is an abundant summer visitor and transient offshore on the inner shelf and is most numerous three to six miles offshore. Hear the call of the…

During the breeding season, this gray-hooded warbler is conspicuous, singing boldly from riparian thickets, clear-cuts, and roadside brush. However, when household cares occupy the daylight hours, they become elusive as field mice, slipping about through the thickets like shadows, only the sharp alarm note betraying their presence to an intruder. After many minutes of careful pursuit, an observer is often left with only a brief glimpse of an olive-colored back or a broken white eye-ring. MacGillivray's warbler is one species that appears to thrive in areas that have been disturbed by industrial forest practices. It has been reported from every…

A thick body, small head and coloration similar to a killer whale make this dolphin easy to recognize. Dall’s porpoise is mostly black with a large white patch on the belly and flanks. The small dorsal fin is partly white and the trailing edges of the tail are frosted white. About seven feet long and weighing around 400 pounds, Dall’s live only in the north Pacific. Dall’s are the fastest of all small cetaceans and can swim at up to 35 miles per hour, almost as fast as a killer whale. When swimming at the surface they create a characteristic…

The yellow-pine chipmunk is one of the smallest in Oregon, only slightly larger than the least chipmunk. Its face is marked with a dark stripe, followed laterally by two alternate light and dark stripes. The outermost light strip is nearly white. It occurs on the east slope of the Western Cascades and eastward through most of the remainder of Oregon, except it is absent from most of the Columbia Basin and much of southern Harney, eastern Malheur, and southern Baker counties. Its range also extends westward in the Siskiyou Mountains in southern Jackson and Josephine counties. Ponderosa pine seems to…