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a white insect, still more a red insect or a blue insect, would be immediately detected and devoured by its natural enemies, the birds and the lizards. But any greyish or yellowish insects would be less likely to attract attention at first sight, and would be overlooked as long as there were any more conspicuous individuals of their own kind about for the birds and lizards to feed on. Hence, in a very short time the desert would be depopulated of all but the greyest and yellowest insects; and among these the birds would pick out those which differed most markedly in hue and shade from the sand around them. But those which happened to vary most in the direction of a sandy or spotty color would be more likely to survive, and to become the parents of future generations. Thus, in the course of long ages, all the insects which inhabit deserts have become sand-colored, because the less sandy were perpetually picked out for destruction by their ever-watchful foes, while the most sandy escaped, and multiplied and replenished the earth with their own likes."
Prof. Clodd, remarking upon this fact, adds: "Thus, then, is explained the tawny color of the larger animals that inhabit the desert; the stripes upon the tiger, which parallel with the vertical stems of bamboo, conceal him as he stealthily nears his prey; the brilliant green of tropical birds; the leaf-like form and colors of certain insects; the dried, twig-like form of many caterpillars; the bark-like appearance of tree frogs; the harmony of the ptarmigan's summer plumage
