Lewis'sWoodpecker: is this food white bread?

A former entomologist with the Colorado State Forest Service emailed me that this food item is not an insect or larvae. He said he thinks it is bread. Since the nest is about a quarter mile from two homes plus farm workers in nearby fields may drop white bread, it would certainly be feasible for this Lewis's Woodpecker to opportunistically appropriate some bread thinking it would be easy-food for the nestlings (though likely not a source of much nutrition for them). In the pics showing this food, it certainly has a strange consistency. For much closer views of this food just click on each pic then click on them again. SeEtta