The NASA Steam Propelled Autonomous Retrieval Robot for Ocean Worlds, or SPARROW, was created to explore icy enviroments in space. For example, Jupiter's moon Europa and Saturn's moon Enceladus are very icy and covered in long spikes of ice. While normal robots would struggle to overcome these obstables, the SPARROW could simply "hop" over them. Powered by steam from melted ice instead of rocket fuel, these robots would also be very enviroment-friendly.
This is an artist's depiction of the NASA SPARROW.