I have several who pick up bits and pieces in the nest box and toss a few on their backs, but Free Bird, one of my EE's really tucks feathers, wood shavings, etc. whatever she can find, in between her feathers all over her back. She doesn't appear to be broody at this point. I just think that some of them are a little closer than others, to their jungle instincts. It's just camo.