It's not just big cities that suffer from traffic jams. They can even happen in more rural areas like Russia's Caucausus region — albeit with some minor differences:

This video has spread wildly since it was uploaded to YouTube. It was filmed in the Caucausus, according to Digital Journal, but little else is known about it — including the animals' motivation.

Australia's Nine Network News takes a crack at explaining the "sheep cyclone," though, coaxing this theory from a sheep breeder in New South Wales: "Sheep who've been hand-fed at some stage in their life think they're about to get fed whenever they see a vehicle. They will get used to chasing and circling moving vehicles. They have no appreciation of the danger involved."

Also on MNN:

Russell McLendon ( @russmclendon ) writes about humans and other wildlife.