White-tailed ptarmigan cover. The white-tailed ptarmigan was introduced into the Sierra Nevada of California, Wallowa Mountains in Oregon, and Uinta Mountains of Utah in the 1970s. It may have been native here during the early Pleistocene but became locally extinct due to climate changes with greater snow-cover in spring impacting on its breeding season. Alternatively, it may have been unable to colonize the Sierra Nevada because of the barriers provided by the Columbia River and the Great Basin, and the low altitudes of the intervening South Cascades. This herbivorous bird's diet varies seasonally. Nitrogen-rich snow buttercup leaves are favored in the spring
Winter white dwarf hamster white is known to be one of the most tameable types of hamsters. The hamster has no fully accepted common name, Winter white dwarf hamster and Russian dwarf hamster are among the most often used. Confusion arises because of their physical similarity to the Campbell's dwarf hamster, consequently the name Djungarian hamster and Russian dwarf can refer to both Winter white and Campbell's dwarf hamsters. The term "Winter white" derives from the fact that in the wild the hamster changes it's fur colour to white for the winter months, this camouflages the hamster and reduces predation when snow is on