Primate voice repertoire

The voices of a primate species tends to be more diverse the larger the groups they form and the longer they spend on grooming. As the number of peers increases and social relationships become more complex, the need to use different sounds increases, and grooming plays a role in maintaining close relationships with peers. Just like grooming, it can be conceived that speech evolved through social functions.

■References (Books, papers, Web articles, etc.)
Grooming, Gossip, and the Evolution of Language  Robin Dunbar Harvard University Press; First Paperback edition (October 1, 1998)
家族進化論』 第5章・第10節 コミュニケーション革命―歌う能力  山極寿一 (東京大学出版会、2012)

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The References list of “Evolution of Human Sociality”