Board Thread:Speculation House/@comment-27265101-20170116064051/@comment-31564841-20170122151515

It is entirely possible that because of how small Menagerie is compared to the other places that the Faunus killed all of the Grimm upon arrival and the Grimm have not had a chance to come back. In Vale, Mistral, Vacuo and Atlas. They are all massive so the Grimm have plenty of spaces to pop up. We see that Grimm are formed in those puddles of Ooze now we can't be certain but Salem's 'Lair' is certainly somewhere on Remnant so these puddles could be everywhere except Menagerie or Salem's Force has to transport the Grimm to the continents but they can never sneak them on to Menagerie. There are many reasons that could be used. Maybe there are some and we have just not seen them yet