The fight against extinction

A silverback mountain gorilla is seen during a census inside Bwindi Impenetrable National Park, about 550 km (341 miles) west of Uganda's capital Kampala, October 14, 2011. The census of the critically endangered mountain gorilla is being conducted by the Uganda Wildlife Authority in Bwindi, which is known to have more than half of the world's mountain gorillas. Teams comprising of rangers and wardens from Uganda, Rwanda and Congo are assembled in the Ruhija sector of the park to begin the pre-census sweep.