HIGHLIGHTS
SUMMARY
There are anecdotal reports of primate species showing possible leave-taking behaviours (e_g, ), although these reports have never been subject to empirical study. Ethological studies of leave taking are lacking, and those that do exist (e_g, ) are not robust in providing replicable methods. Can the authors include the everyday comings and goings and ends of conversations, even when individuals remain in the same place (e_g, )? Can the authors only include departures which mark a complete removal from sight and contact (e_g, )? Several studies attempt this in humans (e_g, ) but there 3 of 20 is . . .

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