I have a Hen Helmet and a Hen Roller. The Helmet has been sitting on a egg I found today on and off. The the roller will come in and sit. As the Helmets return they will chase her off. This is the attitudes of the Helmets I have. The roller will stand at the entrance of the the coop watching for a chance to run in and sit. Is it possible a hen could be jealous of another hens eggs? I now just looked and neither are on the egg. The egg was layed in a area no pigeons sit or nest.