How do ants assess food volume?

@article{Mailleux2000HowDA,
  title={How do ants assess food volume?},
  author={Anne-Catherine Mailleux and J. L. Deneubourg and Claire Detrain},
  journal={Animal Behaviour},
  year={2000},
  volume={59},
  pages={1061-1069}
}
By comparing the behaviour of Lasius niger scouts at sucrose droplets of different volumes, we empirically identified the criterion used by each scout to assess the amount of food available as well as the rules governing its decision to lay a recruitment trail. When scouts discovered food volumes exceeding the capacity of their crop (3 or 6 µl), 90% immediately returned to the nest laying a recruitment trail. In contrast, when smaller food droplets (0.3, 0.7 or 1 µl) were offered, several… 

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