Universe Today has an article about a new Mars concept robot called the Gashopper (not to be completely confused with the little green insect "Grasshoppers"). The gashopper robot would rove around Mars by hopping. To do this, it would first charge up its batteries by the solar panels (which double as wings). Then it would extract C02 gas from the Martian atmosphere and liquify it. When it had enough C02 gas (about a month?) it would heat up the CO2 and release it jetting high up into the air. Then using its solar panel wings it would soar and fly a ways for another landing location to study and land. Then the process would start all over again.