Figure 2:  The evolutionarily stable frequency of mimicry is a declining function of disease prevalence. As the frequency of disease p  increases, the frequency of mimicry maintained in the population x  decreases. Lines show solutions for different values of the parameters δ, the reduction in reproductive fitness due to mimicry, and β, the reduction in competition costs due to mimicry. The base case (δ=0.1, β=0.3) is shown in black; blue lines show the effect of decreasing δ (to 0.05 and 0.01), and red lines show the effect of decreasing β (to 0.2 and 0.15). For all cases, r=c= 1.