Female mountain gorillas seek out old friends when moving to a new group, a new study finds. It turned out, though, that female gorillas did really care if a group had female gorillas that they recognized from the past, either because they’d grown up together or had lived together at some point. Researchers know which gorillas belong to each social group and where they go when they leave that group – because gorillas do tend to leave. But it turns out that female gorillas also really care about the female members of a group. He says this is a novel finding – that female gorillas will essentially seek out their friends when deciding where to go.