The badge says, "Brushed a fox in preserves in each of the 10 regions." Aren't the preserves only in Cauda, Fennec, and Sura? Does it mean brushed a fox in 10 different preserves, habitats, or parks?
Neither was I, until earlier today I found two sneaky unvisited streets in Besara, of all places. I then went on to find more foxy areas in Muufo, Tamila, Alakol, and Andra, I believe. Eh, regardless of whether I remembered the regions correctly or not, there are probably 10-15 fox parks you haven't been to yet. Yay, traveling!
Now I just gotta get those last two basement seam streets...