Douglas fir Douglas-fir forest is the primary habitat of the red tree vole ("Arborimus longicaudus") and the spotted owl ("Strix occidentalis"). Home range requirements for breeding pairs of spotted owls are at least 400 ha () of old growth. Red tree voles may also be found in immature forests if Douglas-fir is a significant component. The red vole nests almost exclusively in the foliage of the trees, typically above the ground, and its diet consists chiefly of Douglas-fir needles. A parasitic plant sometimes utilizing "P. menziesii" is Douglas-fir dwarf mistletoe ("Arceuthobium douglasii"). The leaves are also used by the woolly conifer aphid
Fraser Canyon Gold Rush "humbug". Many returned to San Francisco. A continuing influx of newcomers replaced the disenchanted, with even more men storming the route of the Douglas Road to the upper part of Fraser Canyon around Lillooet; others got to the upper canyon via the Okanagan Trail and Similkameen Trail, and to the lower Canyon via the Whatcom Trail and the Skagit Trail. All these routes were technically illegal since the Governor required that entry to the colony to be made via Victoria, but thousands came overland anyway. Accurate numbers of miners, especially on the upper Fraser, are therefore difficult to reckon. During