Table 1.

Two PCAs used to quantify aggression and duetting. A dash indicates that the behaviour was not included in that PCA.

	Aggression PC1	Duet PC1
eigenvalue	6.72	2.45
per cent variation	67.2	81.5
time spent within 10 m	0.35	—
time spent within 5 m	0.37	—
time spent in mount bush	0.36	—
time spent within 0.5 m	0.33	—
time spent attacking mount	0.19	—
latency to 10 m	−0.26	—
latency to 5 m	−0.31	—
latency to mount bush	−0.35	—
latency to 0.5 m	−0.34	—
latency to attack mount	−0.27	—
total duets	—	0.56
ratio duets : solos	—	0.59
latency to duet	—	−0.58