I though we suddenly had an egg eater among our 4 free range hens but after careful monitoring of the nesting boxes for a few days I saw it..... the friendly bluebird that has been on our property for months was in the nesting box! What Can I do now? It happens in the afternoon when they usually have laid two eggs. Our coop and run is portable so we could relocate them but we really like the current location. Should I fill an egg with mustard as suggested as a way to break hen egg eaters? ideas?