Coloration evidence for natural selection J. Bowler wrote that Darwin's theory In his 1889 book "Darwinism", the naturalist Alfred Russel Wallace considered the white coloration of Arctic animals. He recorded that the Arctic fox, Arctic hare, ermine and ptarmigan change their colour seasonally, and gave "the obvious explanation", that it was for concealment. The modern ornithologist W. L. N. Tickell, reviewing proposed explanations of white plumage in birds, writes that in the ptarmigan "it is difficult to escape the conclusion that cryptic brown summer plumage becomes a liability in snow, and white plumage is therefore another cryptic adaptation." All the same, he notes, "in spite
Buffalo Mountain Trail the Gore Range. Looking like a fattened herbivore curled on its side beneath a covering of winter snows, Buffalo Mountain overlooks Silverthorne, Dillon, Keystone, and Frisco. Buffalo Mountain Trail ascends through a lodgepole pine forest, past exposed rock formations, into a steep boulder field of krummholz. The trail continues along the east-facing ridge to a nearly flat tundra near the summit. Buffalo Mountain offers views of the Ten Mile Range to the south, Grays Peak, 14,270 feet, and Torreys Peak, 14,267 feet, to the southeast, and the Ptarmigan Wilderness. Greatest Hikes in Central Colorado: Summit and Eagle Counties, a hiking