These terrible blights eventually creep into cemeteries and when they get there they will fight to the death to keep their new feeding ground. If left alone to feed their size is unlimited. People might be more inclined to invite these creatures into their burial ground in order to elimininate waste if they didn't sometimes snatch up a child of domestic animal...and if people were okay with their deceased being systematically disolved into an ooze. Instinct: To protect their feeding ground

• Feed off the dead