Table 1. The proportion of ants fighting increases with density of nestmates (n = 18/group).

The mean proportions reported are number of fights per ant.

Density	1:1	2:2	3:3	4:4	5:5
Mean ± SD	0.167 ± 0.38	0.26 ± 0.35	0.27 ± 0.29	0.36 ± 0.32	0.39 ± 0.29
Density	6:6	7:7	8:8	9:9	10:10
Mean ± SD	0.44 ± 0.30	0.52 ± 0.32	0.64 ± 0.31	0.63 ± 0.27	0.69 ± 0.29