At 24 square miles, Fongoliis the largest home range of any habituated chimpanzee group ever studied. Harvard primatologist Craig Stanford likens foraging over a large range to knowing one's way around an enormous supermarket. Like Pruetz, he believes the chimpanzees are not foraging at random. but moving with foresight and intent. "You don't stroll down the aisles hoping to catch a glimpse of the broccoli. You know where each item is, and in which months seasonal foods are likely to be in stock The same, he thinks, holds true for chimpanzees.