Table 1. Principal component factor loadings for the analysis of (a) vocal and (b) physical aggressive behaviors of male and female white-throated sparrows to simulated territorial intrusions.

(a)	Vocal Response	Male PC1	Female PC1
	Songs	−0.71	−0.16
	Chip calls	0.58	0.72
	Trills	0.40	0.67
	Variance Explained	44%	39%

The percentage of variation in these responses explained by the first principal component (PC1) is noted in italics.