The partial Mantel tests showed that kids from the same group had more similar overall call structures than kids from different groups, at both 1 week (before Bonferroni correction) and 5 weeks old. Their calls had more similar fundamental frequency contours and energy spectrums at 1 week old, and more similar energy spectrums and formant contours at 5 weeks old. Full siblings had more similar overall call structures than half siblings at 5 weeks old, but not at 1 week. At 5 weeks old, their calls had more similar fundamental frequency contours (before Bonferroni correction) and formant contours (Table 3; Appendix Tables A3, A4).