Every once in a while my girls throw some straw out of one of the nest boxes. It always seems to be the same box, so it might be the same girl. They seem to have their favorite boxes and they'll perch and glare (yes, chickens can glare!) at the one in their favorite box until the other girl either gets out, gets finished or she herself gets distracted or decides to pace a while. Mine don't like very much straw in the nest, so what looks cozy to me isn't so much for them. Go figure!