Table 1. Summary of PCA.

	Playback	12 hours	24 hours	48 hours	72 hours	96 hours	Last day
	N	17	17	16	16	16	13
PC1	Eigenvalue	2.01	1.97	1.88	2.27	2.07	2.22
	% of variance	50.14	49.34	47.07	56.86	51.70	55.39
Wilcoxon Test	Z	1.86	1.78	3.35	3.07	2.84	3.11
	p	0.063	0.076	0.00081	0.0022	0.0045	0.0019

The composite response scores based on principal component 1, and the Wilcoxon matched pairs comparisons for each playback event. Significant differences in maternal responses between filial pup and non-filial FACs are highlighted in bold.