Dian has been around since the early nineties when he was already fully flanged. We don’t know Dian’s exact age but he seems to be quite old.
Dian is a rather quiet and relaxed flanged male. After Islo lost his dominance position, Dian seemed to take over the Southern part of the research area. He successfully defended this area for almost two years. During this time, the females seemed to trust Dian and frequently associated with him.
The mothers of the juvenile girls would even lead their daughters towards Dian whenever those got harassed by unflanged males. Dian would then reliably chase off these males.
In late 2016 however, Dian got more and more challenged by immigrating males. At the moment it is unclear if he is still the dominant male in the South.