Untitledanswer back or die; but the first three reasons have most to do with thevery common assumption of some sort of disguise. Even when an animal isin no sense a weakling, it may be very advantageous for it to beinconspicuous when it is resting or when it is taking care of its young.Our problem is the evolution of elusiveness, so far at least as thatdepends on likeness to surroundings, on protective resemblance to otherobjects, and in its highest reaches on true mimicry.Colour Permanently Like That of SurroundingsMany animals living on sandy places have a light-brown colour, as isseen in some lizards and snakes. The green lizard is like the grass andthe green tree-snake is inconspicuous among the branches. The spottedleopard is suited to the interrupted light of the forest, and it issometimes hard to tell where the jungle ends and the striped tigerbegins. There is no better case than the hare or the partridge sitting afew yards off on the ploughed field. Even a donkey grazing in the dusk
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