It's a popular saying that nothing goes to waste in nature. But occasionally, animals seem to kill for no discernable reason. (And it's not just murderous prairie dogs offing their competitors.) Foxes and wolves, among other predators, sometimes engage in surplus kills, when they take down more prey than they can likely eat.

Such a surplus kill event apparently went down in northwestern Wyoming this week, when a gray wolf pack seemingly dispensed with 19 elk in a single night.

"Normally one or two elk a night here and there is no big deal, but 19 in one night is fairly rare," Wyoming Game and Fish Department supervisor John Lund told a local TV station.

Officials think the Rim Pack of