On Sunday morning, I found a soft egg (very thin/weak shell) in the duck house. The other two eggs were perfectly fine (we have three ducks). Then, both yesterday and today, we've only had two eggs, so one girl has completely stopped laying. They seem to be in the very final stages of a molt, and have been laying consistently since mid-December. Could it be they're getting ready to take a break for awhile, or is something else going on? They have daytime access to both store-bought and straight-from-the-ocean oyster shell, so I'd be surprised if this is a lack of calcium. However, we did recently switch them from "Mazuri Breeder" to "Mazuri Maintenance" feed, since the "Breeder" was out of stock and we're waiting for our special order to arrive. Could they be having issues with lack of protein? They all seem a bit lethargic and cranky, but once again, I'm not sure if that's from the change in feed, warmer than usual days, or something else. Thanks for any help!