Space.com has an article under their "Space Age Gear" section about Mesicopters which are concept penny sized 4 rotor aerial robots. These tiny fingernail sized robots would be dumped by the bunches into a planet's atmosphere and they would explore the planet by taking hops and pausing between hops while they charge their batteries via a tiny solar cell. These vaporware Mesicopters are probably better suited for planets with dense atmospheres and low gravity like Saturn's moon Titan than the thin atmosphere and higher gravity of Mars. So next time you shew away those annoying gnats, it might really be Mesicopters instead!

Click here to go to the Space.com web site then go to Space Age Gear section. I guess they don't allow deep linking to their space age gear articles.