Female túngara frogs, Physalaemus pustulosus, are preferentially attracted to a whine-chuck advertisement call over a simple whine (Rand & Ryan 1981, Zeitschrift für Tierpsychologie, 57, 209-214). Females also show phonotactic preferences for the whine when a number of other heterospecific or artificial stimuli are added to it, and these calls tend to be as attractive to females as a whine-chuc...