Fig. 4.

Diagrammatic illustration of the socially preferred nonmother matures for each immature in a 2018 and b 2019. The images on the left line are immatures and those on the middle and right lines are candidate matures. Images with blue frames indicate natal immatures and senior females, and those with orange frames do immigrant immatures and immigrant females. Images with gray frames are immigrant blackback and young silverback males. The silverback is framed in black color. Square and round shapes indicate male and female individuals, respectively. Bold solid lines mean a socially preferred mature with the highest NN-HWI value exceeding a threshold. Thin solid lines mean a socially preferred mature with the second highest NN-HWI value exceeding a threshold. Thin dashed lines mean a mature with the highest NN-HWI value that does not exceed a threshold. Candidate matures shown in the grayscale image are individuals with no NN-HWI values fitting the above criteria. The individual names are given on the left side or below the images. The NN-HWI values are given on the line connecting an immatures and a preferred mature