I've read that if runner ducks have curly tail feathers, they are drakes. Do these look like all male tails? I have only 5 runner ducks. All of them have a feather or two on the tail with some curl to it. I tried to get some good pics of their tails this morning - they don't like to stand still for pics lol! They are right around 20 wks. No eggs as of yet but I'm not sure when runner ducks begin to lay. What do you think?