A 22-year-old mountain gorilla named Mafuko was recently spotted in the Democratic Republic of Congo holding twins, an encouraging sight for conservationists. There are only about 1,000 mountain gorillas in the wild, and to see twins is “exciting, because it’s incredibly rare,” Tara Stoinski, the CEO of the Dian Fossey Gorilla Fund, told National Geographic. Mafuko and her babies live in Virunga National Park, and officials say the twins, both males, appear to be healthy.