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 the volcano's smoke—the face of Keraptis himself, say those who should know. Is the vile wizard immortal after all? Or is there an even greater threat building beneath White Plume Mountain? In 1999, several supplements updated the best-loved "Dungeons & Dragons" adventures from the past, among them "" (1999), "Dragonlance Classics 15th Anniversary Edition" (1999), "Ravenloft" (1999), "Return to the Keep on the Borderlands" (1999) and "Return to White Plume Mountain" (1999). 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