In this filed photo from Monday, Oct. 1, 2007, cowboys on horseback move a herd of buffalo across the hills of Custer State Park near Custer, S.D. The crew uses horses, ATVs and pickup trucks to ... more 
In this filed photo from Monday, Oct. 1, 2007, cowboys on horseback move a herd of buffalo across the hills of Custer State Park near Custer, S.D. The crew uses horses, ATVs and pickup trucks to gather most of the park's bison and lead them into corrals to be vaccinated, branded and culled. less 
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Associated Press | Photo By Dirk Lammers
Fri, Sep 24, 2010 6:26 PM EDT