Shane Martin says a feral goat headbutted the glass door of his Cobar shop for about 20 minutes, leaving the door and three glass panels shattered. Kristy DiGiacomo, a senior lecturer in production, animal nutrition and physiology at the University of Melbourne, said the goat's behaviour was all about scarce resources. "Goats will headbutt for various reasons, including dominance, mating competition, defence, or just for play," Dr DiGiacomo said. She said goats' "personalities" can change with t