I traded for some three week old call ducks from someone on here (Hi ) who got them in a sale/trade. All she could tell me was their age and that they are "English Calls". After a little googling I decided they are Grey call ducks, the ones marked like a mallard duck. So here is my question: by the age 0f 4 weeks I should be able to tell the males from the females, right? Is there any possibility that the drakes start feathering out like a female and then later get the distinctive male coloring? (All my ducks are looking like hens) Please tell me yes, cause having all girls is just marginally better than having all boys when it comes to birds. My kids and I lost our hearts to call ducks the first time we saw a picture of them. We love these three (girls) but we want babies, too! Thanks for any help and does anyone have a drake for sale?