Wind-powered walking machines

The Animaris Rhinoceros Transport is a type of animal with a steel skeleton and a polyester skin. It looks as if there is a thick layer of sand coating the animal. It weighes 2. tons, but can be set into motion by one person. It stands 4.70 meters tall. Because of its height it catches enough wind to start moving. MPEG video here. (From Jamie Zawinski's blog.)