Prodos is a self contained bipedal robot that can "walk". The servos aren't powerful enough to make Prodos move under its own weight, so it must be suspended in the air to move.
The animation is composed of 30 frames that are derived from 8 key positions. Spline based interpolation is used to derive the joint positions for the frames in between the key positions.
The skeleton that is used for the animation has 10 degrees of freedom (joints), however only 8 are used in the Prodos because it only has 8 servos (the 2 toe joints are ignored).