Clark Barrett, a professor in the anthropology department at UCLA and an expert on predator-prey dynamics, describes the deer’s advantage as the anywhere but here principle: all a prey animal needs to do is be anywhere the predator isn’t—it doesn’t matter if it’s a foot away, or a hemisphere—and it will live another day. The predator, on the other hand, must be exactly where its prey is, and at exactly the same moment, or it will starve.
