nt evolution toward a particular singular strategy Zs which is not an ESS. In this case, once Z 2', evolutionary E F TA_R 1_02076889 EFTA02702885 J.W. Olefarz n at /Journal of Theowrkol Biology 399 (2016)103- fie II) a There is full policing. (1-41) • 1.20 1.15 .= 1.10 g 1.05 1 02 0.4 0.6 0.6 Int