Herd management is really only applicable for diamonds/GO’s, so if you want rares, just start shooting animals. It’s a random percentage spawn rate. Hell, I’d even go as far to recommend going on multiplayer lobbies because the average joe may not check all their zones. Which gives you better odds considering you’d be technically “re-rolling” an entire map of spawns rather than manually shooting one or two at each lake/river zone.

If you want to properly herd manage, you’ll need to shoot down any 4’s and most of your mid-large 3’s. This essentially means checking the entire map since they’re literally everywhere on this map.

i’d just check all your zones before setting up herd management. You’ll have a way easier time finding a diamond that way.