Man vs monkey: The similarities don't seem to end. Sucking up to win the support of the boss dates back to our furry ancestors. And the motivation, for monkeys, is life and death. Rather than grabbing coffee for the CEO, monkeys have for eons picked dead skin and bugs from the fur of higher-ranking monkeys. They do it in exchange for backing in fights, livescience.com reports. The finding, detailed in a recent issue of the journal Behavioral Ecology, resolves a historical question about primate grooming.