This is either because of apostatic selection ( i.e. the birds have learned the orange monarchs can be eaten ) , because of camouflage ( the white morph matches the white pubescence of milkweed or the patches of light shining through foliage ) , or because the white morph does not fit the bird 's search image of a typical monarch , so is thus avoided .
The white form does not fit the birds ' search image of a normal Monarch , and so it is not eaten .