I was trying to fix a caravan guard ghost by finding the corpse and moving it in adventure mode, but got sidetracked exploring a necromancer tower that I embarked next to because I had a previous adventure character die there. Everything in the tower was dead so I looted the adventurer, and was presumably killed by said adventurers corpse in the fortress area ( I'd taken a bow and dagger, the corpse was unarmed ). I reclaimed the fortress and there were river otters, merchants, and wagons all over the place, lampreys, sturgeons, and otters littering the rivers. Of course accompanied by a massive frame rate drop when unpaused.