Martin Giurfa, An Insect\u2019s Sense of Number. Trends in Cognitive Sciences, Volume 23, Issue 9, 2019, Pages 720-722, DOI: 10.1016/j.tics.2019.06.010.
Recent studies revealed numerosity judgments in bees, which include the concept of zero, subtraction and addition, and matching symbols to numbers. Despite their distant origins, bees and vertebrates share similarities in their numeric competences, thus suggesting that numerosity is evolutionary conserved and can be implemented in miniature brains without neocortex.