Primate males often make loud vocalizations that are thought to have functions such as the declaration of territory. The best example is the territorial songs of gibbons. The males and females sing alone, but it becomes a duet when, as a pair, they defend their territory together. However, the territorial song of the gibbons is genetically determined, and does not change through learning.
■References (Books, papers, Web articles, etc.)
『サルのことば——比較行動学からみた言語の進化』 小田亮 （京都大学学術出版会、1999）
『新・霊長類学のすすめ』 京都大学霊長類研究所編 （丸善出版、2012）
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