Table 1.

Showing the species and group differences in association scores for mountain and western gorillas. Provided are the mean ± s.d., the range of association scores and the total number of scans, the number of scans when no other female was within 5 m, the number of dyads where the observed score was higher than the mean expected score from 1000 randomized permutations, the number of dyads that were preferred associates and the total number of dyads.

	association score
gorilla species or group	mean ± s.d.	range	total number of scans	scans with no other female present	number of dyads with score greater than chance	number of preferred associates	total number of dyads
western	0.028 ± 0.018	0.002–0.101	10 435	7 362 (70.55%)	38 (50.67%)	6 (8%)	75
mountain	0.050 ± 0.025	0–0.173	95 574	32 958 (34.45%)	149 (38.60%)	82 (21.24%)	386
breakdown of mountain gorilla groups:
KYA	0.053 ± 0.030	0–0.173	73 739	22 251 (30.18%)	130 (41.94%)	72 (23.23%)	310
ORU	0.034 ± 0.018	0.002–0.087	12 223	7 382 (60.39%)	19 (41.30%)	10 (21.74%)	46
BIT	0.050 ± 0.013	0.027–0.071	9 612	3 325 (34.59%)	0 (0%)	0 (0%)	30