Dante II is a frame walking robot that is able to descend into volcano craters by rapelling down the crater. The frames are separated by a track along which the frames slide relative to each other. An example of a track driven robot is Pioneer , a robot developed to clear rubble, make maps and acquire samples at the Chornobyl Nuclear Reactor site. Pioneer is track-driven like a small bulldozer which makes it suitable for driving over and through rubble. The wide track footprint gives good stability and platform capacity to deploy payloads.
Many robots use wheels for locomotion.
These rovers were battery powered and had radios and antenna's just like the Mars Pathfinder rover Sojourner. But unlike Sojourner, these rovers were designed to seat two astronauts and be driven like a dune buggy. The Sojourner rover's wheels and suspension use a rocker-bogie system that is unique in that it does not use springs. Rather, its joints rotate and conform to the contour of the ground, which helps it traverse rocky, uneven surfaces. For example, one side of Sojourner could tip as much as 45 degrees as it climbed over a rock without tipping over.