If he (or she) acts like an ape, it’s because he’s at the top of the pecking order (and if you want to keep your job, you’ll "groom" him).

When a subordinate chimpanzee grooms a dominant one, it often does so for a long time and doesn’t wait to be "asked." When it in turn requests to be groomed, it receives only a perfunctory grooming, after having to ask a second time.
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