Blue Wren

Looks like a male Superb fairy wren (aka Blue wren). They're very good at getting inside through windows. I have had them in the house, as well as one having gotten in through the open of a parked car and was clearly unable to figure out how to get out again. The males often sit on the top of the car door and preen at their reflections in the side-view mirror and that was probably how he found his way in.