Every once in a while I like to take a break to appreciate wacky ol’ nature. Last time it was upside-down pandas peeing on trees. This time: vampire bats running on treadmills.

Yes, it turns out vampire bats can run on all fours, an evolutionary trait that comes in handy as they prey on hapless victims. Being able to hop and run is useful “when you’re a bat slurping cow blood, because cows are heavy and can kick or roll over and squash a bat,” explains Cornell University researcher Daniel Riskin, who reported the findings in the latest issue of Nature.

What fascinates me almost more than the image of sprinting bats: the fact that people get paid to watch.

Grist thanks its sponsors. Become one.