Investigators have analyzed videos of vampire bats charging down plexiglas runways, and learned that they have evolved a novel running gait. Here are a few stills of the action:

Desmodus rotundus, using a running gait at 0.61 m s^-1 with a stride frequency of 4.71 Hz. Images are shown at 24-ms intervals; the background is a 1.0-cm2 grid.

You can also watch the movie.

And here's the abstract from the paper:

Most tetrapods have retained terrestrial locomotion since it evolved in the Palaeozoic era1, but bats have become so specialized for flight that they have almost lost the ability to manoeuvre on land at all. Vampire bats, which sneak up on their prey along the ground, are an important exception. Here we show that common vampire bats can also run by using a unique bounding gait, in which the forelimbs instead of the hindlimbs are recruited for force production as the wings are much more powerful than the legs. This ability to run seems to have evolved independently within the bat lineage.

And then, of course, they are also capable of popping themselves up into the air with a single push of their forelimbs, unfolding their wings, and taking off into flight. What magnificent alien beasties!

Riskin DK, Hermanson JW (2005) Independent evolution of running in vampire bats. Nature 434:292.