Being In A Rut
A scientist once ran an experiment which he called "processional caterpillars." He lined up caterpillars on the rim of a pot that held a plant so that the lead caterpillar was head to tail with the last caterpillar, with no break in the parade. The tiny creatures walked around the rim of the pot for a full week before they died of exhaustion and starvation. Not once did any of the caterpillars break out of the line and venture over into the plant to eat. Food was only inches away, but the “follow the leader” instinct was even stronger than the drive to eat and survive!