Two Ankole-Watusi bulls lock horns in their enclosure at the zoo in Duisburg, western Germany on August 1, 2013. AFP PHOTO / DPA / HORST OSSINGER GERMANY OUT (Photo credit should read HORST OSSINGER/AFP/Getty Images)
GERMANY-ANIMLAS-BULLS
Two Ankole-Watusi bulls lock horns in their enclosure at the zoo in Duisburg, western Germany on August 1, 2013. AFP PHOTO / DPA / HORST OSSINGER GERMANY OUT (Photo credit should read HORST OSSINGER/AFP/Getty Images)
