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This mid-sized, pink-legged gull has caused much of the confusion in west coast gull classification and identification. Its plumage characteristics are similar to Herring, Iceland, and some Glaucous-winged hybrids, and great care is needed for correct identification. It differs from the Herring gull in having a much smaller bill, a darker eye, less black in the wing-tips and, often, a more rounded head. Opportunistic feeders, Thayer's gulls regularly concentrate about landfills, food-processing plants, and over fish runs. It is a common migrant and fairly common winter visitor along the coast. The largest wintering numbers are found in the Portland metropolitan…

Skuas are the size of a Western gull, dark with a pale nape and large white patches on the bases of the primaries on both the upper and lower surfaces. This is a solitary bird. Its flight is low and direct with heavy flapping and little gliding. It steals food from other seabirds, and is aggressive, bordering on predatory. It may grab a shearwater's head, wing, or tail and shake and kick the bird until it regurgitates its food. Chances of detection are best around flocks of shearwaters feeding behind fishing boats. It is a rare to uncommon fall transient…

Belding's ground squirrel is a medium-sized ground squirrel without spots, stripes, or splotches. The pelage is smoky gray with some pinkish on the face, feet, and venter, and with a more or less well-defined reddish or brownish band in the middorsal region. The tail is cinnamon on the ventral surface. This squirrel occurs south and east of a line connecting Enterprise, Heppner, Maupin, Wasco Sisters, Diamond Lake, and south to Fish Lake. It may occur in steppe and shrub-steppe area, particularly in meadows; sagebrush flats; and small-grain pasture , and hay-crop fields, and sometimes in openings in woodlands. The Belding's…

Adult tiger salamanders are relatively large with olive-colored blotches outlined in black. They have gray undersides and can grow to 13 inches in total length. As adults, tiger salamanders live almost entirely on land, returning to the water to breed. Terrestrial adults spend a lot of time in burrows that they or other animals have dug. Tiger salamanders are found in grassland and shrub-steppe habitats. It is unknown whether tiger salamanders occurs naturally in Oregon, or whether they were introduced by people after larval salamanders used for bait colonized fishing lakes and ponds. Photo by Matt Reinbold, Flickr

A white form on the distant water may be the sides and breast of an adult male, whose deep green head and dark back are less visable when far away. The pearl gray bodies and white breasts of females, subadults, and eclipse males are starkly delineated from their full-crested chestnut heads. Long, slender, saw-tooth bills are held horizontally during surface swimming and grip squirming prey after an underwater chase. From coastal bays to the high Cascades, in all corners of Oregon and far beyond, common mergansers ply the rivers and peer into still waters in their efficient pursuit of fish…

In quiet backwaters and wooded wetlands, these stunning ducks can occasionally be seen skulking near the shoreline as they search for fish. The male with a striking black head and extensible white crest, white breast, black back, and chestnut sides is truly a sight to behold. Females and immatures are quite plain by comparison: dull grayish-brown except for a reddish brown crest. Hooded mergansers are surprisingly secretive and local during the breeding season. They breed locally throughout the Willamette Valley west to the coast and south to Coos County. They are casual from April to early October in the Umpqua…

These small, fast flying seabirds are unique among alcids in North America in their use of coastal coniferous forests, primarily old-growth trees, as nesting habitat. Their solitary nests are usually concealed within the forest canopy, and breeding birds are cryptic and primarily crepuscular at nest sites. Because of their secretive behavior and elusive nests, Marbled murrelets were considered the "enigma of the Pacific" and were one of the last ornithological mysteries in North America, as the first nest was not discovered until 1974. Distribution at inland nesting sites is fragmented, as birds occur only in areas where suitable habitat remains…

The Rocky Mountain tailed frog’s coloring often matches the color of local rocks ranging from brown or reddish-brown to gray. They have grainy textured skin that further enhances their camouflage. Males have a short tail, the signature for tailed frogs. Adult males are slightly smaller than adult females that grow to two inches in length. Rocky Mountain tailed frogs are found in the water or close by it. They live in very shallow and heavily shaded water of fast-flowing, small, permanent streams in older mountain forests with cold and clear water, rocky substrates and little silt. These streams are often…

While recreationally harvesting green crab has been allowed for decades, the Oregon Fish and Wildlife Commission recently increased the daily bag limit to 35 crab. This gives recreational shellfishers an opportunity to help native shellfish by taking more of these invaders home. European green crab are an invasive species in Oregon. While recreational harvest is allowed (35 per day), harvesters must correctly identify these crabs (see below) as they often are mistaken for native species. Green crab: Compete with native crabs for food. Larger green crab may eat smaller native shellfish. May disturb eelgrass beds important to native fishes and…

Peregrine falcons are among the most charismatic and noted of the world's birds. They are described as the fastest animal on the planet, and have been recorded reaching speeds in excess of 240 miles an hour in dives after prey. They are one of Oregon's boldest raptors, and have been observed usurping active Golden eagle nest sites, stealing fish from Ospreys and ground squirrels from adult Bald eagles who stray into their territory. It has, for perhaps 4,000 years, been used by falconers because of its skill in capturing game birds in tandem hunts with humans. Peregrines are medium-sized raptors…

This is one of the most widespread and familiar waterbirds in Oregon. It is the largest heron in North America, standing approximately four feet tall. It is slate gray with a white crown, cheeks, and throat, rusty thighs and a uniformly yellow bill. Adults develop long gray-white plumes on chest, neck, and back during breeding. Juveniles have similar plumage but may be distinguished by absence of breeding plumes, a dark crown, and dark upper bill. Great blue herons frequent many habitats from shallow areas of marshes, lakes, streams, and oceans, where they feed on fish, amphibians, and aquatic invertebrates; to…

Humpback whales are seen during their north and south migrations from northern waters to breeding grounds near Hawaii and also feeding offshore during the summer. Humpbacks have been documented travelling 3,000 miles between Alaska and Hawaii in as few as 36 days. They are usually five to 15 miles offshore, so they are most often seen by fishers. Humpback whales live in all major oceans from the equator to sub-polar latitudes. Humpbacks eat primarily krill and small fish and can consume 3,000 pounds of food a day. Humpbacks grow to 60 feet in length with a stocky body, an obvious…

Like the name suggests, harbor porpoises remain close to shore and in river estuaries and bays usually less than 650 feet deep. This makes them the most likely porpoise seen from shore. They seem more shy than their larger, more gregarious cousins, like the Dall’s porpoise or bottlenose dolphin. You won’t see them riding the bow waves of boats. They are also not as social, usually seen alone or in small groups of two or three, rarely more than five individuals. Found throughout the temperate coastal waters of the Northern Hemisphere, harbor porpoises are the smallest of the Northern Pacific…

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…

Sperm whales inhabit all oceans of the world, and have been observed in Oregon waters from March through November. Sperm whales are usually found in deep off-shore waters so they are only occasionally seen off Oregon by fishers and birders on offshore trips. It is the largest of the toothed whales and possesses the largest brain of any animal with an enormous head to house it. Sperm whales have 20 to 26 large conical teeth found only in their lower jaw. A mature male can grow to 52 feet long with its head representing up to one-third of its length…