Apparently an invading army was laying seige to the Hohensalzburg once upon a time. The situation inside the fortress got so bad that they were eventually down to just one ox to eat. To try to convince the seigers that they were doing fine, they paraded this one ox up and down the walls of the fortress, then painted it black and did it again, trying to convince them that they had more to eat than they actually had. The plan worked and the invading army left. Who knew? So now there is a random half-black and half-brown ox inside the Hohensalzburg.