I think it may be the stars Sirius, Capella, or Arcturus. Sirius "The dog star". is quite apparent in the way it sparkles but I'm not sure it would be in the south. It's just a little below Orion in the winter sky. It has a unique feature that makes it sparkle red and green and white. It's the brightest star in the heavens and the sparkling is very apparent with binoculars.