Sheep are followers. But what if they were following… a traitor?
The Judas goats aren’t only used to round up stock destined for immediate death. Another variation from the Galápagos involves painting a sterilised goat red, attaching a transmitter, and releasing it to find feral goat herds out in the wild. The Wikipedia article also mentions Judas camels in Australia and Judas raccoon dogs in Europe.