Honeybees maximize efficiency by not filling their crop

@article{SchmidHempel2004HoneybeesME,
  title={Honeybees maximize efficiency by not filling their crop},
  author={Paul Schmid-Hempel and Alejandro Kacelnik and Alasdair I. Houston},
  journal={Behavioral Ecology and Sociobiology},
  year={2004},
  volume={17},
  pages={61-66}
}
SummaryHoneybees often abandon non-depleting food sources with a partially filled crop. This behaviour does not maximise the net rate of energy extraction from the food sources, and thus contradicts predictions of some common models for central place foragers. We show that including the metabolic costs of transport of nectar leads to models that predict partial crop-loading. Furthermore, the observed crop loads of honeybees are less consistent with those predicted by maximization of delivery… 

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