I have three mallards that are almost 6 weeks old. I have a few questions; Since they are mallards will we have to pinion them or will they stay home? (We live close to a lake and a river. Another duck lady said since they are mallards they will leave.) A very common question: how do you sex them? I have one that has started quacking. This specific duck has green tinged tail feathers and a darker beak than my other two. The others are still peeping have no green at all and the bills are turning light. Today I noticed one duck has a lot of white showing up on the wings. The others have white as well, but not near as much. Lastly, can they continue to be kept with the chickens? They get along well as of right now.