If you plan to go invis to check MM spawn (given that, like me, you aren't a tracker :)), beware because these cats see invis and have HUGE agro range. I saw them running to me as soon as I was able to see them and believe me it was far. Fortunately, I managed to run to HoHa zone without being hit at all, which means other NPCs on the way didn't agro...
/kiss runspeed3 and fixed duration invis ...
By the way I considered them att at 65 and they were all blue so I guess they are level 64 or under.