Bearded Dragons and most other insect eating herps have an open door policy on what they will eat. If it moves and they can get it into their mouth then they will eat it.

I do not believe that a bearded dragon will actively hunt mammalian prey in the wild. The way their body type is I don't see them ever coming into contact with a pinkie mouse (or whatever rodent type is in Australia.) I could be wrong but even though it probably HAS happened I don't feel its very common. I have only read about their captive care and not much about their wild habits but this is just what I see from a Beardie as a predator type. If anything I'd see them getting at baby birds in nests more than anything.

The insects and plants that they would eat in the wild would provide them with the necessary nutrients that they need.

When I hear the excuse "In the wild" I would immediately point out what they have in their setup. Beardies will go into trees, I'd bet that the person barely had anything to climb on in the cage. In the wild they have live plants to crawl on. Does that person have plants in the cage? You could go on and on.

The one thing that is 100% true is that feeding a live adult mouse to a bearded dragon is stupid. It only puts the pet at risk and there is no gain other than satisfying morbid curiosity. They are not designed to quickly immobilize rodent prey.

We feed FT to snakes partly because of this risk factor and killing rodents is what a snake is designed to do.