Video S1. A video of a bee solving a counting task from Counting insects

Slow-motion video of the flight path of a bee previously trained to select stimuli with two items and avoid those with four. The first 11 s of the bee's scanning behaviour are shown (extended in slow-motion by a factor of 2). The bee sequentially examines two patterns containing four items, but rejects each of them after scanning three items in each. She then chooses a pattern containing the correct number of two dots (even though she has not been rewarded on any other dots than yellow ones before) and finally selects another pattern with the correct number of two (yellow) dots.