Vampire Bats are the only kind of bats that are know to run. A bunch of scientists at Cornell University were able to video tape a bat running on a treadmill and have published the pictures and the video on the web. It's worth taking a look at. The bats have a really interesting way of running. The longer arms/wings really give them a push up, it's more like a hop then your traditional gallop, all the limbs seem to come down at the same time.