For the moment though, they are still completely dependent on their parents who seem to feed them in erratic bursts. This is partly prompted by our refilling the mealworm feeder, but the male has never taken advantage of this source of food, preferring to pick his green caterpillars from the local trees. Just recently, he brought in an enormous one, and having failed to get it down the throat of two of the chicks, he left in disgust with it still in his beak. Thirty seconds later he was back and this time one of them managed to swallow the thing. Whether he processed it in some way when outside, or whether it was a case of third time lucky, I don't know.
From the chicks' point of view, they are never fed often enough - you can see which one is looking smug here! (A parental tail can be seen making a hurried exit, at the bottom of the picture.)