This is a really clever idea that I'm surprised I've never seen before. Researchers from UC Berkeley put a tail on an RC car robot which moves up and down to stabilize it in the air as it goes off jumps and such. The tail simply turns to move the rest of the car body in the desired position as it flies through the air. Based on conservation of angular momentum, if the tail applies a torque within the tail-body system and moves one way, the body must counteract that and move in the other direction. They are using simple but interesting physics to their advantage. This is all based on how lizards and dinosaurs jump with their tails.
The video below is helpful. It shows the car dropped from an initially nose-down position and recovering to be level, as well as going over a steep bump.
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