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A review of tests of ideal free distribution (IFD) theory reveals a characteristic bias: patches with a small proportion of the resources are relatively overused and patches with a larger proportion of the resources are relatively underused. A model is developed to examine how animals with limited abilities to perceive differences in patch quality affect an IFD by foragers. This constraint produces the observed bias, a bias that is exaggerated as the number of patches increases. Sutherlanddoi:10.1007/bf00300543 fatcat:pjicvh4a55ginbzhqjxnyiywty