In many primate species, individuals in the same group will often "groom" each other to get rid of ectoparasites and matting in their fur. This behavior is an example of:

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This behavior is an example of reciprocal altruism, where individuals in a group help each other in order to receive help in return. By grooming each other, they are removing ectoparasites and matting in each other's fur, which benefits both parties.

In Many Primate Species, Individuals in the Same Group Will