Hello, hive mind: Bees can do basic arithmetic, a new study finds - The Washington Post

The oval-shaped brain of a honeybee is roughly the size of a single sesame seed. It contains fewer than 1 million neurons, while the human brain contains 100 billion. A team of entomologists is asking what all those extra nerve cells are good for after finding that bees can do the kind of fundamental mathematics once thought to distinguish humans and the primate animals they most closely resemble...
https://www.washingtonpost.com/nation/2019/02/26/hello-hive-mind-bees-can-do-basic-arithmetic-new-study-finds/