Yellowstone national park http://gounesco.com.s3-ap-southeast-1.amazonaws.com/wp-content/uploads/2014/06/22155104/YELAW1585_bison_Hymen_aw_2.jpghttp://gounesco.com.s3-ap-southeast-1.amazonaws.com/wp-content/uploads/2014/06/22155104/YELAW1585_bison_Hymen_aw_2-150x150.jpgAfnan Kayal