I could always put up some chicken (or turkey) wire fence around the main vege patch if it became a major issue.
nah, they're pretty good fliers.
Too right about the snake. I spotted one big python around my waterfall today - which is about 50m from the turkey mound. One of my resident water dragons was keeping a very close eye on it from a higher rock. A bit unusual to see the big fella around in the wet and cold.