Figure 2. The study subjects are habituated to the presence of human observers and go about their daily lives un-interuputed while they are being observed. Left: Senior Observer J. Kinyua Warutere, who has been with the project since 1995, collecting daily monitoring data. Right: Amboseli often provides excellent observation conditions. Here, the author observes baboons on a short-grass plain. Photo credits: Jeanne Altmann (left), Robert Zimmerman (right).