If it was in Stockton it pretty much has to be a yellow billed. The black billed are everywhere but the central valley. A friend raised one many years ago. It was tamer and friendlier than many chickens. It was turned lose after being raised from a baby but never left my friends home area. It would fly down and land on your hand or arm and could talk quite well. It would say "pretty bird squaky", and it would wolf whistle, plus say other things. Really a neat bird. Squaky was a male, and mated with a wild bird, and raised a number of families around my friends house. The mothers and the babies would come around you but no closer than maybe eight feet. Kern
Wow what a neat story. They sound like a really cool bird.