I'm curious about the ducks that lay all winter. Mine never have, but my neighbor's have. We both have Runners. The only difference I've seen is that she keeps a light on all night for protection and my area is dark. During a very cold spell last winter I put a red heat lamp out for them to huddle under for several weeks, and hormonal behavior began much earlier than usual. The poultry industry utilizes artificial light to maximize laying, so I'm wondering if the winter layers here are getting light at night or is it just a quirk with individual ducks?