White-tailed ptarmigan entry into the respiratory tract. The most obvious adaptation is this bird's cryptic coloration, which enables it to blend in with its environment and avoid predation by golden eagles or other birds of prey. To conserve energy during the winter months, the ptarmigan avoids flight as much as possible and roosts in snowbanks. The white-tailed ptarmigan is listed as being of "Least Concern" by the International Union for Conservation of Nature. This is because, although populations may be in slight decline, its range is too wide and the total number of birds too large to fit the criteria for being
Ptarmigan (sternwheeler) allowed the vessel to be more capable of pushing barges, which increased the vessel's utility and effective cargo capacity. "Ptarmigan" was placed on the Columbia River route that began at Golden and ran south, at least during high water, to Columbia Lake, the ultimate source of the Columbia River. In 1903, soon after completion, "Ptarmigan" was sold to the Columbia River Lumber Company, which hired Armstrong to manage its steamboat operations. In 1907 "Ptarmigan" hit a snag and sank (A snag is a sunken log jammed in the river bottom but sticking up through the water to just below the