https://motherboard.vice.com/en_us/article/panae9/honeybees-can-add-and-subtract-study-finds

Honeybees can perform mathematical calculations such as addition and subtraction, according to a study published Wednesday in Science Advances.

A team led by Scarlett Howard, a postdoctoral fellow at the University of Toulouse who goes by the handle “the beesearcher” on Twitter, devised an experiment that demonstrated that these insects could recognize gains and losses.