1. A robotic life form simulating a live creature responsive to a changing environment sensed by the robot, said robot comprising: a robotic body articulated for motion around an upright axis and supported by at least two legs terminating in respective feet, each of said legs having at least two joints, said body having a neck terminating in a head provided with eyes and a mouth, internal and external input sensors located on said robotic body and responsive to touch, sound and lighting conditions, motion, food, temperature, voice commands, time of day, and obstacles and hazards, including a head touch sensor, a plurality of touch sensors extending along a torso of said body, and a plurality of touch sensors on said feet, means responsive to said sensors for determining drive index levels in accordance with priority criteria selected from a plurality of animation groups comprising a mood of the robot, a physical state of the robot, a state of the robot determined by food, health of the robot, and an emotional state of the robot, and a plurality of servo actuators associated with said body and responsive to dominant drive indexes for causing the robot to execute animations resulting therefrom.