I am wondering if there is a way to sex and age these Appleyard ducklings. There are four Ancona's I hatched four weeks ago as well. I am trying to sex the Appleyards but can't tell by voice yet. Some are lighter and I was wondering if that ment they were girls or is it just the different duckling colors, mallard looking vs. traditional Appleyard duckling? (Yes,there are five white Appleyard in the lot) thank you for help/advice.