The frequency with which fast-rate chuck calls were given by different classes of sentinels.

<p>Dominant females = DF, dominant males = DM, subordinate females = SF, and subordinate males = SM. Within individual status, there was no difference between sexes (DF-DM, p = 0.12; SF-SM, p = 0.20). Within individual sex, there was a significant effect of dominance for females (DF-SF, p = 0.027, effect size = 0.207) but not males (DM-SM, p = 0.94) – dominant females produced fewer fast-rate chuck calls than subordinate females. Analysed using the package “languageR” and the function ‘pvals.fnc’ (uses Markov Chain Monte Carlo simulations; <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0025010#pone.0025010-Baayen1" target="_blank">[37]</a>).