Mechanisms of food size selection by bullfinches (Pyrrhula pyrrhula L.) feeding on sunflower seeds

@article{GreigSmith1986MechanismsOF,
  title={Mechanisms of food size selection by bullfinches (Pyrrhula pyrrhula L.) feeding on sunflower seeds},
  author={P. Greig-Smith and D. R. Crocker},
  journal={Animal Behaviour},
  year={1986},
  volume={34},
  pages={843-859}
}
Abstract Size-selective feeding is usually discussed in relation to ‘optimal diet’ models, which provide no indications of mechanisms of choice. In a series of experiments, captive bullfinches were presented with single sunflower fruits, pairs of fruits, and batches of fruits, and we attempted to discover how they discriminate among fruits of a continuous range of sizes and shapes. We investigated: (1) the proximate cues (e.g. size, shape, weight) that birds use in deciding whether or not to… Expand
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