AA << trained individual honey bees to the numerical concepts of "greater than" or "less than" using stimuli containing one to six elemental features. Bees could subsequently extrapolate the concept of less than to order zero numerosity at the lower end of the numerical continuum. Bees demonstrated an understanding that parallels animals such as the African grey parrot, nonhuman primates, and even preschool children. >>
Scarlett R Howard, Aurore Avargues-Weber, et al. Numerical Ordering of Zero in Honey Bees. Science, 360 (6393), 1124-1126. 2018 Jun 8. doi: 10.1126/science.aar4975.
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