Researchers feared only around 50,000 Western lowland gorillas left worldwide . Now 125,000 primates have been discovered in northern Congo . Score: 6 Expert : Each gorilla makes a nest to sleep in at night . This is the highest-known density of gorillas that 's ever been found .
Researchers feared only around 50,000 Western lowland gorillas left worldwide . Now 125,000 primates have been discovered in northern Congo . Score: 6 Expert : This is the highest-known density of gorillas that 's ever been found .