Very interesting!
I have always wondered why so many articles tell you to remove the bark when making your own perches as I’ve watched many wild birds (mainly SC2’s) having a blast removing the bark from branches themselves. I always leave the bark on the branches I use for Burt (and now Pip and Squeak too), they really do seem to enjoy stripping it and sometimes playing with it.
It’s interesting to think they do consume things like bark in the wild but we remove that pleasure from them for fear of crop impaction or potential problems. I can understand removing toys they are ingesting but I sometimes think we worry a little too much about a lot of the natural items we offer our birds. They are smart animals and are naturally programmed to know a lot of what they need.