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These big, medium-brown sparrows with variable grayish faces and heavily streaked or blotch undersides can be found in summer at higher elevations across much of the state except the Coast Range. Darker brown birds from more northerly breeding populations are common in western Oregon in winter, often coming to feeders, where they scratch like towhees for seed on the ground. Hear the song of the Fox sparrow Photo by Robin Horn, Flickr

California myotis is an acrobatic flyer. It is dark brown to blond with dark ears, and feeds on 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. The California myotis is an Oregon Conservation Strategy Species found throughout the state except for the Columbia Basin. Photo by ©Michael Durham

The song of this wren is often mistaken for the Song sparrow in the thickets and open woodlands where it resides. When in view, however, its long tail, thin bill, and white line above its eye are distinctive. Found in a variety of habitats, it readily takes advantage of cleared forest grown to large shrubs, especially blackberries. It is a permanent resident west of the Cascades, in Klamath and Warner basins, and along the upper Columbia River and tributaries. Hear the song of the Bewick's wren Photo by David Hoffman, Flickr

The Pacific wren makes its home in dense coniferous forests with understory thickets where it often forages for insects. This bird was considered the same species as the winter wren but is now separated as its own distinct species. The Pacific wren is rufous brown above, richly colored below, and barred with a darker brown and dusky. Young birds are distinctly less barred. It’s most easily found by its sharp kep-kep call and ringing, tinkling song. Males defend territory by singing in spring and in hopes of attracting a mate.

Merriam's ground squirrel is one of the two small gray ground squirrels in Oregon without stripes or spots. Most of the geographic range of this squirrel is in Oregon, where it occurs south and east of a line connecting Huntington, North Powder, Maupin, Warm Springs, Bend, and Fort Rock, Summer Lake, and Plush. This species does not occur south of the North Fork Owyhee River in Malheur County. These ground squirrels emerge in early March, breed, rear their young, become exceedingly fat and go into their hibernacula by early August. Photo by ©John Rakestraw

Cassin's auklet uses a few offshore lands for breeding in Oregon. It forages in the marine environment and nests in a chamber under rocks or digs its own burrow, two to six feet long, in the soil. This species spends its day at sea and only comes to the burrow at night, perhaps to reduce discovery by predacious Western gulls. Although few Cassin's auklets nest in Oregon, nesting sites are found along the entire coast where offshore rocks provide appropriate habitat. During the non-breeding season this is the most abundant alcid seen at sea in Oregon. They are present offshore…