We have 2 "free range" (in the back yard) ducks that seem to have done everything right. The female had started to lay eggs a month and half ago. We weren't sure if they were fertilized but she's been sitting on them so we let her do her thing. We just got back from an 8 day trip and her eggs are starting to show signs of the ducklings trying to get out. Seeing movement in one of them and the opening has gotten bigger overnight. Will see what we get over the next 48 hours. We're excited and the kids can't wait to see what happens.