" [Dolphins] produce signature whistles, which are high-pitched sounds with a modulation that is unique for each individual [...]. Females keep the same melody for the rest of their lives, whereas males adjust theirs to those of their closest buddies, so that the calls within a male alliance sound alike. (p. 262) "
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![Frans de Waal quote : [Dolphins] produce signature whistles, which are high-pitched sounds with a modulation that is unique for each individual [...]. Females keep the same melody for the rest of their lives, whereas males adjust theirs to those of their closest buddies, so that the calls within a male alliance sound alike. (p. 262)](/image/971020.jpg)