I visited a milking ranch once and the rancher told me the cows tend to line up to be milked in a regular order. There is a hierarchy in the herd and the lower status cows get the back of the line. A change in the order indicates something is up
It's amazing to me how "scientists" often know very little about the things they are studying. Ask someone who actually WORKS in the field and they can tell the scientists all sorts of information. The scientists may still be useful to measure and quantify the common knowledge, but it is hardly a new discovery.