Thus, increasing group members' knowledge can clearly improve the efficiency of a moving group, and the underlying processes have become a focus of intense scientific interest. Couzin et al.'s (2005) mathematical model of collective motion suggests that CDP 840 information can propagate through a group even when group members are not aware of who has relevant information. Also, democratic decision making that results in less extreme decisions is predicted to be more beneficial and widespread among animal groups (Conradt & Roper, 2003). While a strong theoretical framework dealing with questions of experience and group navigation has been developed, empirical validations of model predictions, in particular experiments using wild subjects, remain limited (but see Banks and Guilford, 2000, Bousquet and Manser, 2011, Flack et?al., 2012 and Guilford and Chappell, 1996). Thus, one of our aims was to provide a qualitative assessment of microevolution theories based on experimental results from a natural system.