I've done it. I stayed in Creature Stage for weeks, I checked and double-checked, and I have finally managed to kill every single living thing that moves apart from my own species on the continent. Even the EPICS are dead. Now to move onto Tribal stage and regret that I'm unable to migrate to other continents and kill everything there as well, as new species will unduobtedly b doubting my claim to killing everything there is. I must say, I've forgotten how much fun it is to completely go the omnicidal path in this game.