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
Return to White Plume Mountain Return to White Plume Mountain Return to White Plume Mountain is an adventure module for the "Advanced Dungeons & Dragons" roleplaying game released in 1999 by Wizards of the Coast under its then recently acquired "TSR" imprint. It is set in the "World of Greyhawk" campaign setting and is a sequel to Lawrence Schick's 1979 module "White Plume Mountain". The 64-page book was written by Bruce R. Cordell and updates the legend of the eponymous mountain and its previous inhabitant, the sorcerer Keraptis. In the Greyhawk timeline, the events in the module are assumed to occur 20 years after the