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A survey of 47,000 square kilometers of forest and swampland in northern Congo has revealed a previously unknown population of endangered western lowland gorillas. The estimated tally of 125,000 gorillas in this region doubles previous counts of this subspecies of gorilla. The results of the survey, which was led by teams from the Wildlife Conservation Society and the government of the Republic of Congo, may propel the establishment of a new protected area in the region.