Table 1.

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

Aggression PC1Duet PC1
per cent variation67.281.5
time spent within 10 m0.35
time spent within 5 m0.37
time spent in mount bush0.36
time spent within 0.5 m0.33
time spent attacking mount0.19
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 duets0.56
ratio duets : solos0.59
latency to duet−0.58