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Experienced daily (8-h daylight) predation risk for a bird foraging intensively (behaviour 1, dashed curve), or more cautiously (behaviour 2, solid curve), under baseline parameter values. We assume that a bird can gain up to 1 g of fat before mass-dependent effects on acceleration and manoeuvrability will have an effect on predation risk (Kullberg 1998; Brodin 2001). Observe that this is a parameter of the model, not a prediction from it
