Two of my pullets are eating feathers off the run floor. They're not pulling them from themselves or others, they just chase the feathers when they blow around, catch one, and eat it like spaghetti. I raked up a bunch of feathers and threw them out, but any remaining were gobbled up by these two! They are free fed on Purina Start and Grow. They had a sprinkle of scratch and some tomato ends, a spoon of leftover cream of wheat, and a bread crust today. It's only my Buff Orp and Easter Egger that are eating feathers. My RIR and Australorp are busy with scratching and dust bathing. This is the first day they've spent in their run, we just finished it and I wanted them to get used to it. Tomorrow they're going back to the chicken tractor during the day. They eat feathers there, too, though. Is this normal for 3 month old pullets?