If one only follows the analogies, then it stands to reason that the enormous differences in behavior (and neural processes) that exist between, e.g. human beings and insects, indicate equally great differences in their corresponding direct experience or sentience. Fancying the qualities of sentience of the lower animals is best left to poetic writers like Fechner, Bergson, or Maeterlinck. As regards the mental life of robots, or of Sciven's (1953) "androids," I cannot believe that they could display all (or even most) of the characteristics of human behavior unless they were made of the proteins that constitute the nervous system --- and in that case they would present no puzzle.