Space.com has an article about a robotic flying "insect" called the "Entomopter" that is specially designed to fly in the maritan atmosphere. It would be used to scout ahead for rover missions (or to get a birds-eye-view for astronauts), and carry scientific sensors. They say its refuelable and revolutionary. It has a 3-foot wingspan, and can carry 33lb loads. They also continue on why they chose the "insect wing" type of lift instead of the standard "airplane" type.
Quite an interesting read.