In an article published in Nature, a group of chimpanzees tested 66 of these animals, which had to interact with a type of vending machine that required several steps before presenting a reward in the form of peanuts. The results show that bumblebees can also acquire skills, which they do not develop on their own even if they are allowed to try for a while by watching others do it. This is a clash between those who advocate changes, and non-change.