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
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