Abstract
Mallards ( Anas platyrhynchos L.) distribute themselves between two patches of food in a close approximation to the distribution predicted by the ideal free model. However an important assumption of this model is violated since the despotic behaviour of some individuals results in different birds receiving unequal payoffs. The distribution of the birds between the food patches is influenced by the distribution of these despots. Evidence is presented to suggest that the ducks initially use the frequency of supply of food items at a patch to assess its profitability, but they can, over a longer time scale, use other cues.
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