Passive food sharing among adults is most frequently observed in great apes, and also in New World moneys living in Central and South America.

In both taxa, mothers are subject to a high child rearing cost, as great ape infants have a long growth period, and New World monkeys often give birth to twins or triplets.

■References (Books, papers, Web articles, etc.)
How Humans Evolved (Eighth Edition)　　Robert Boyd　W. W. Norton & Company; Eighth edition (December 1, 2017)
『人類進化論——霊長類学からの展開』　第6章　社会的知性とコミュニケーション　　　　山極寿一　（裳華房、2008）

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■The References list of “Evolution of Human Sociality”