(a) The expected and observed number of loud-calls per hectare occurring within 100m of the territories of both related (n = 8) and unrelated neighbouring groups (n = 9).

<p>(b) The number of calls per hectare occurring in proximity to an individual’s largest and smallest neighbouring group, in terms of the number of adult individuals they contain (n = 7). (c) The number of calls per hectare occurring in proximity to an individual’s largest and smallest neighbouring group, in terms of the number of unrelated, opposite sex adult individuals they contain (n = 7). (d) The daily weight gain of individuals both when we observed at least six loud-calling bouts, and when no loud-calling behaviour was witnessed (n = 10).