Thanks. My chickens love foam too. I think it has to do with the texture, and possibly the taste. Since it's plasticy they can't really digest it, so I'm guessing most of it goes through them.
I've always wondered, what is it about Styrofoam that chickens crave? My chickens LOVE any Styrofoam, or foam insulation they can get their beaks on. Anyone know why they like it so much?