Having trouble telling your Drake's from your ducks. Well this is the right article for you jacks are some of the easiest country to sex. Here is one simple and easy way to tell the nails heads and necks should be heavier than the females.also if they're starting to quack all the ones that are actually quacking instead of rasping are females. If you still can't tell just go to your local breeder and see if they will sex them for you. They might use the method called vent sexing. You can look in someone else's article to see how to do that.