RNPS IMAGES OF THE YEAR 2010 - SWITZERLAND - Two Herens cows lock horns during the annual "Battle of the Queens" cow fight finals in Aproz in the western Alpine canton of Valais May 9, 2010. Each year when taken to the alpine pastures, the cows test their strength and fight for the herd's leadership. The competition continues until a new queen has forced all the other cows to retreat. REUTERS/Valentin Flauraud (SWITZERLAND - Tags: ANIMALS IMAGES OF THE DAY)