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Of several swans found in Oregon, the tundra swan is by far the most common during the non-breeding season. It is most readily distinguished from the similar-appearing trumpeter swan by voice, although subtle differences in physical appearance and behavior can separate the two with difficulty. It is a fairly common transient throughout the state but most abundant at large bodies of water and wetland complexes east of the Cascades including the Malheur National Wildlife Refuge and the surrounding Harney Basin, Summer Lake Wildlife Area and the Klamath Basin. Hear the call of the tundra swan Photo by Kathy Munsel, ODFW

Features: While in the ocean, Chinook salmon often have a purple hue to their backs with silvery sides and bellies, large oblong black spots on the back, and round black spots on both lobes of the tail (note that tail spotting may be obscured in ocean fish by “silver” in the tail). Upon returning to freshwater to spawn, Chinook darken in color and develop red on their bellies and fins. A key identifier is the black gum line on the lower jaw with dark colors both inside and outside of the gum line. Spawning generally occurs from August to early…

Features: Color varies, but walleye are generally dark olive-brown on top grading to almost white below. Walleye have two well-separated dorsal fins; the first fin has a large black spot at its rear base. The opaque eyes, giving the fish its common name, and canine teeth are other prominent features. Habitat: Walleye are found in the Columbia, Willamette and Snake rivers. In the Willamette River, the walleye fishery is generally limited to the section downstream from Willamette Falls at Oregon City, although a few have been documented as far upstream as Dexter Dam. Walleye prefer large, clean and cold or…

Large and primarily white, the American white pelican has the longest wingspan of any bird in Oregon. It also has an enormous orange bill, and flies with neck withdrawn. During the breeding season the top of the bird's head becomes dusted with black and a horn grows on the upper mandible; this projection serves as a target for aggressive encounters to avoid injury to the essential bill pouch, but is shed after the eggs are laid. This pelican makes unusually long flights for feeding and migration, and at great distances, soaring flocks have been reported as UFOs. In Oregon, it…

Although quite common in the U.S., the Black-crowned night-heron's nocturnal and crepuscular feeding habits can make it difficult to locate. Its habitat consists of marshes, lakes, rivers, and other wetlands, where it feeds mostly on fish. It is a thick-billed, medium-sized, stocky heron with relatively short neck and legs. Adults have a black back and cap which contrast with the pale gray or whitish underparts. Immatures have brown backs with large pale spots and heavily streaked underparts. A distinctive choking squawk call is often heard at dusk. It is a fairly common summer resident east of the Cascades where it…

The Greater sandhill crane is Oregon's tallest bird. This large majestic crane has a guttural gurgling or bugling call, and is easily noticed in flight by its profile, with long neck and head extending straight ahead and long legs trailing behind. The Greater sandhill crane is distinguished by its red crown and white cheek patches, contrasting with with a light gray body. Fledged young resemble adults, but have a feathered forehead, a lighter tawny plumage, and lack the red crown and white cheek patches during their first fall. Fledged young have a squeaky cheap call often heard in flight during…

The rock scallop ( Crassadoma gigantea) lives in the swift current shallows of Oregon's nearshore rocky reefs. Due to the coloration at its hinge, it is also known as the purple hinged scallop. These highly specialized scallops cement themselves to rocks, primarily at depths from 10 to 150 feet. They feed on microscopic plankton they filter from the water and reproduce via broadcast spawning. In order for spawning to be successful, they need to be close to one another. For this reason, it is best to harvest solitary rock scallops and minimize harvest pressure on dense aggregations which are more…

Sea turtles are federally protected under the Endangered Species Act of 1973. NOAA Fisheries is responsible for conservation and recovery of sea turtles in the marine environment, while the U.S. Fish and Wildlife Service is lead on conservation and recovery of sea turtles on nesting beaches.

Invasive species are animals and plants that are not native to an ecosystem and that cause economic or environmental harm. Not all non-native species are invasive, however many become a serious problem. They can aggressively compete with Oregon's native wildlife for food and habitat.

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