buffalo , Horseback riders , Custer Park buffalo roundup , near Custer, South Dakota. 水牛，騎馬

Ryan Soderlin / AP

Ryan Soderlin / AP
PhotoBlog - Custer Park buffalo roundup attracts 15,000
http://photoblog.msnbc.msn.com/_news/2011/09/27/7999680-custer-park-buffalo-roundup-attracts-15000