<p><b>Stumptail Monkeys.</b>
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Stumptail monkeys (<i>Macaca arctoides</i>) are among the most conciliatory members of the genus Macaca. They are heavily built, yet remarkably friendly and tolerant, such as here: the alpha male is eating attractive food unperturbed by an entire audience around him. When stumptail monkeys were housed with a less tolerant macaque, they modified the latter species' behavior into a more pacific direction.
(Photograph by Frans de Waal, used with permission.)
CC BY 2.5
de Waal FBM: <i>Peace Lessons from an Unlikely Source.</i> PLoS Biol 2/4/2004: e101. <a href="//doi.org/10.1371/journal.pbio.0020101" class="extiw" title="doi:10.1371/journal.pbio.0020101">doi:10.1371/journal.pbio.0020101</a>