Fig. 3.
Relationship between proportions of specific call types and sequence size. Bars and whiskers indicate the mean proportion + 2 SEM of the specific call type in vocal sequences of that given size, and lack of whiskers indicates that there was no variation in the proportion values. Call types are (A) exhale grunts, (B) inhale grunts, (C) exhale moans, (D) inhale moans, (E) wobbles, and (F) yawns.