Summary of social units in the new dataset.

First, last, and total years of observation for each group and/or solitary male. The composition includes the average number of gorillas, adult females (AF), silverbacks (SB), and blackbacks (BB); as well as the percentage of observation months in which the social unit was multimale (%mmg). Female-years equal the combined number of days that each female an adult during the study, divided by 365.25.