I have two possible Khaki Campbell ducks. (They might be dark Khakis or even from a Campbell / black runner cross) They hatched out the last week of June and are now 21 weeks old. At least one is laying eggs. They both have pretty much the same feathers, though sometimes one looks like it has a curly tail feather. I can't tell by the quack because both are mostly quiet but if alarmed make a waak! sound. My other ducks are only 8 weeks old so I know they aren't laying the eggs. So do I have 2 ducks or a duck and a drake? If I do have a drake at what age will he get a green head, solid khaki body feathers and a dark tail?