Table 1.

Kokolopori bonobo and Ngogo chimpanzee clustering tendencies

	Year	Population size*	Mean silhouette coefficient†	% Misclassification rates‡	Optimal cluster numbers§
Kokolopori	2017¶	35 (0.66)	0.40 (2)	0	2, 3, 3 (0.34)
	2018	55 (0.57)	0.33 (4)	3	4, 5, 4 (0.52)
	2019	51 (0.5)	0.46 (4)	0	4, 5, 4 (0.66)
Ngogo	2011	104 (0.70)	0.14 (3)	27	3, 7, 4 (0.33)
	2012	106 (0.68)	0.16 (2)	2	2, 7, 3 (0.31)
	2013	105 (0.69)	0.15 (2)	6	2, 7, 4 (0.32)

*In parentheses the population sex ratio (male/female).

^†In parentheses the optimal number of clusters.

^‡Percentage of observations with negative silhouette values.

^§Optimal number of clusters by different methods: from left to right, the silhouette coefficient, affinity propagation, and modularity. In parentheses is the modularity value.

^¶Only individuals of two potential groups (Ekalakala and Kokoalongo) included.