Data for: Multiple mechanisms for inbreeding avoidance used simultaneously in a wild ape

Mating with close kin can have considerable negative fitness consequences, which are expected to result in selective pressure for inbreeding avoidance mechanisms, such as dispersal, mate choice and postcopulatory biases. Captive studies have suggested that inbreeding avoidance through mate choice is far less widespread than expected and may be absent where other mechanisms already limit inbreeding. However, few studies have examined multiple mechanisms of inbreeding avoidance simultaneously, particularly in the wild. We use 13 years of detailed dispersal, copulation, and paternity data from mountain gorillas to examine inbreeding avoidance. We find that partial dispersal of both sexes results in high kinship in multimale groups, but that copulations between close kin occur 40% less than expected. We find strong kin discrimination in mate choice, with significant avoidance of maternal kin but more limited avoidance of paternal kin. We find no evidence for post-copulatory inbreeding avoid..., , , # Data for: Multiple mechanisms for inbreeding avoidance used simultaneously in a wild ape

[https://doi.org/10.5061/dryad.zcrjdfnk3](https://doi.org/10.5061/dryad.zcrjdfnk3)

**Copulation data:** Between 2003 and 2015, the Fossey Fund monitored between 3 and 12 gorilla groups for up to 4 hours each day. During monitoring, copulations were recorded both *ad libitum* (i.e., whenever observed) and as part of the focal follow protocol. In each year, in each multimale group, we extracted copulations that were observed between opposite-sex pairs in which the female was over the age of 6 years (n=71) and the male was over the age of 9 years (n=52) by the start of the year, and both individuals were present in the same group for the entire year. We extracted the total number of copulations observed between the pair during the year. The number of hours of *ad libitum* and focal observation for each pair in each year was also calculated. Groups with fewer than 700 hours of observation in a year ...