Silverback Gorilla Joins London Zoo

LONDON, ENGLAND - MAY 02: Kumbuka, a 15-year-old western lowland gorilla, explores his new enclosure in ZSL London Zoo on May 2, 2013 in London, England. The silverback male, who weights 185 kg and stands seven foot tall, moved from Paignton Zoo two weeks ago. It is hoped that Kumbuka will mate with the zoo's three female gorillas to increase numbers of the critically endangered species as part of the European breeding programme. (Photo by Oli Scarff/Getty Images)