A cowboy rides a bull out of the pen as he competes in the El Dorado Rupinini Rodeo in Lethem, southeastern Guyana, April 23, 2011. The origins of the Rupinini Rodeo go back to the middle of the last century when Guyanese cowboys competed against each other at their separate ranches in the various skills. Picture taken April 23, 2011. REUTERS/Andrea De Silva (GUYANA - Tags: SOCIETY ANIMALS)