The creatures that belong to this herd are located only in one place on this earth, that being Marion, South Australia. They are a strange creature returning to a big blue cavern to gather and distribute, some as often as daily. They turn a matching blue when they do so and have a mating call of "service 2 to POS" which sees them gather at a special meeting place in the cavern. The 504's have a symbiotic relationship with the mysterious Shopper, who they lead around and offer the fruits of their labour in exchange for the buck.
