My 3 Runner Ducks are 13 weeks old, 1 male and 2 females. I have the opportunity to bring home 3 more Runners that are 15 weeks old. I'm going to look at them in a few days and choose the females. I'm hoping I can hear the difference between the males and females. Because my 3 now have such distinct sounds between the girls and boy, I'm confident I'll be able to find the girls in the new ones I'm going to look at. Being so close in age do I need to separate them until they are familiar with each other? I'm brand new to ducks so I'm not sure the right way to do an introduction. There is a lot of info out there and I'm looking for some advice from folks who have been through it. My coop isn't large enough to separate them but I do have a small garden shed that I can make into a temporary shelter for the new ducks if that's the recommended way. Thanks in advance for your advice!