It's a sight straight out of the 1800s - herds of buffalo stampeding across the black hills of South Dakota Monday, as part of a massive roundup. Cowboys on horseback and some in pickup trucks chase the animals into corrals as part of this annual event. Fifteen hundred buffalo live in this sprawling state park, and every single one of them is publicly owned. The event, in fact, is open to the public and spectators lined fences a good safe distance away. There is a point to all of this, beyond putting on a show. Once they're corralled, the animals are then branded, vaccinated, and sorted. Some of them are then chosen to be put up for auction next month as the park limits the overall size of the herd. Diane Kepley, The Associated Press.