Figure 9From: Optimal control problem arises from illegal poaching of southern white rhino mathematical modelControl optimal simulation. The dynamic of each compartments, killed white rhino, and the intervention. The black curve represents no intervention, \(h^{*}=0\), the red curve represents the intervention is carried out with constant rate, \(h^{*}=0.6908\), and the blue curve represents the time-dependent intervention, \(h^{*}(t)\)Back to article page