What is the best evidence for kin selection in primates?

What is the best evidence for kin selection in primates? Kin selection is
difficult to demonstrate empirically in primates. Often researchers just demonstrate
some favoritism towards kin and call this “kin selection”. What are the strongest cases
for kin selection in primates – where preferential kin treatment was shown to lead to
predator protection, some other form of survival selection, increased reproductive
success, or offspring survival? Are there any?

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