Quantity discrimination by zebrafish (Danio rerio).

@article{Potrich2015QuantityDB,
  title={Quantity discrimination by zebrafish (Danio rerio).},
  author={Davide Potrich and Valeria Anna Sovrano and Gionata Stancher and Giorgio Vallortigara},
  journal={Journal of comparative psychology},
  year={2015},
  volume={129 4},
  pages={
          388-93
        }
}
Discrimination of quantity (magnitude) was investigated in zebrafish (Danio rerio). Male zebrafish chose to approach the location previously occupied by the larger in number between 2 groups of female conspecifics (no longer visible at test) in sets of 1 versus 2 items, and 2 versus 3 items, but failed at 3 versus 4 items; similarly, when tested with larger numbers, zebrafish succeeded with 2 versus 4, 4 versus 6, and 4 versus 8 items, but failed with 6 versus 8 items. The results suggest that… 

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