highly significantp = 0.001
In contrast, age exerted a highly significant effect at the first step for frequencies between 500 and 625 Hz (χ 2 = 14.2, p = 0.001).
In contrast, age exerted a highly significant effect at the first step for frequencies between 500 and 625 Hz (χ 2 = 14.2, p = 0.001).
The effect of age on frequency discrimination within the 410–550 Hz range was marginally significant ( p = 0.06), but age had no significant effect within the 550–750 Hz range ( p = 0.13).
Thirty-five day birds showed a slight trend toward calling back more to the female call than to the male call (Wilcoxon, p = 0.07) and there was no effect of frequency on the call-back response to synthetic calls (Friedman, p = 0.86).