Vampire Bats occasionally sneak up on their prey on foot. Elegant flight patterns transform into awkward but fascinating quadrapedal + bipedal movement when they gain speed. The perverted behavior of the bat, especially when it begins its creepy gallop (Thanks Jason), points to an architecture which might do work, albeit in a non-optimal way, in favor of rich affect.

Vampire running! from Carl Zimmer on Vimeo.