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Fig. 4. The complex effects of partial preference and of low, medium, and high (specific) foraging costs on the proportion of preferred food in the diet, in relation to its abundance in the vegetation, as predicted by a model that seeks the optimal trade-off between the benefits and costs of foraging selectively (Thornley et al., 1994). Solid diagonal line: high foraging costs; dashed curved line: moderate foraging costs; solid curved line: low foraging costs.
