Dog tags/round you can get them stamped in the metal pre_numbered/ thin metal labels you can write on are chewed up by animals overtime. Setup a database to keep more information. They can be glued with thick super glues, epoxy or tied on to whatever your choice of stake, that can offer permanence. Forget hard and softwood stakes. Bamboo stakes for wiring them on work pretty well. A brick can be used if you designate larger areas of a type. They are on amazon. These will last for decades. If you use screws to fasten them. Buy brass or stainless, makes recovery of the tags easier later.
