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Declining probability of simulated overkill as the cause of the megafaunal extinctions in relation to the departure from maximal predation efficiency (when z = 1 in the equation of functional response, where predation rate = FPz/[G + Pz]; see ref. 47). The parameter z can be interpreted as a proxy of relative megafauna naivety and has been fixed at 1 in all previous megafaunal extinction models, implying complete prey naivety.
