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Pirarie Sharp-tailed Grouse’s scientific name is Tympanuchus Phasianellus Jamesi. Clark noted Sharp-tailed Grouse occurred only west of the James River. Round and chickenlike with long and pointed central tail feathers and a small, slightly crested head. Purple skin patches are visible on the males neck dying courtship displays.

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The willet, formerly in the monotypic genus Catoptrophorus as Catoptrophorus semipalmatus, is a large shorebird in the family Scolopacidae. It is a relatively large and robust sandpiper, and is the largest of the species called "shanks" in the genus Tringa.

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The loggerhead shrike is a passerine bird in the family Laniidae. It is the only member of the shrike family endemic to North America; the related northern shrike occurs north of its range, however it is also found in Siberia.

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At that time Captain Lewis referred to the animal as a "remarkable small fox." Two days later one was shot, and it was carefully described by Lewis. He noted its remarkably long claws, and later (July 26) mentioned the black tip of its tail, another distinguishing feature of the species.

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The least tern is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the little tern of the Old World. Other close relatives include the yellow-billed tern and Peruvian tern, both from South America.

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The long-billed curlew is a large North American shorebird of the family Scolopacidae. This species was also called "sicklebird" and the "candlestick bird". The species breeds in central and western North America, migrating southward and coastward for the winter.

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Eulachon’s scientific name is Thaleichthys Pacificus, it is also called the candle fish. Large winter runs of the fat Eulachon were an important source of oils for native diets. On the evening of February 24, 1806 the Corps was visited by the Clatsop. They brought with them these small fish. Lewis said they were superior to any fish he had ever tasted.

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The dusky grouse is a species of forest-dwelling grouse native to the Rocky Mountains in North America. It is closely related to the sooty grouse, and the two were previously considered a single species, the blue grouse.

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The thick-billed longspur, formerly McCown's Longspur, is a small ground-feeding bird in the family Calcariidae, which also contains the other longspurs and snow buntings. It is found in North America and is the only species in the genus Rhynchophane.

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Silky wormwood, with leaf variation and flower detail. Juniper and Sparrow Western Juniper and adult lark sparrow. Bushy-tailed Woodrat, adult with cache. The bushy-tailed woodrat was first accurately described by Lewis and Clark, but the species was not formally named until 1815. They encountered it in the vicinity of Great Falls on July 2, 1805, and captured a live specimen.

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Lewis first described this bird to be near the Great Falls, Montana. In his journal Lewis compares his newly discovered meadowlark with the eastern meadowlark. They have a long, pointed tail and bill and a white stripe above and below both eyes. There are almost no differences in physical appearance of the male and female. The only thing used to distinguish them is that the females are slightly smaller in size.

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Lewis “lark woodpecker” was likely to be the northern subspecies of the “yellow shafted” or Northern Flicker common to the east. Lewis said “This bird is about the size of the lark woodpecker or the turtle dove, tho' it's wings are longer than either of those birds. The beak is black, one inch long, reather wide at the base, somewhat curved, and sharply pointed; the chaps are of equal length.”

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Clark's nutcracker, sometimes referred to as Clark's crow or woodpecker crow, is a passerine bird in the family Corvidae, native to the mountains of western North America. It is a jay sized bird with a long dagger like bill and short tail. Dark grey overall with black wings and white under tail coverts.