This is why large-primate researchers are forced to spend endless hours sitting around watching their subjects methodically foraging and eating if they are ever to witness them doing something more interesting. We know that most of the larger primates spend between eight and ten hours per day foraging and eating. This equates to something between a fifty-six- and seventy-hour workweek. Chewing, digesting, and processing the leaves, pith, stalks, and roots is also time-consuming and energy-intensive.
