Ozzie, the world's oldest known male gorilla in captivity, examines his edible gifts as he celebrates his 52nd birthday at Zoo Atlanta in Atlanta, Georgia, USA, 26 April 2013. Ozzie, a western lowland gorilla, was born in the wild of Africa on 24 April 1961 and has sired 12 offspring, according to zoo officials. Erik S. Lesser/European Pressphoto Agency