I bought a new appliance and the box had some styrofoam in it. I didn't think much of it, just left it in the box. DD took some of the styrofoam outside and left it in the sidewalk. I looked outside to see three of my birds eating it. They quite a bit gone before I caught them. I know chickens have an amazing digestive system, but I am not sure how it handles styrofoam. Am I going to lose 3 birds?