We started out with 3 ducks - 2 pekins and 1 rouen. My son so wanted the rouen to be a male and named him gary. Well Gary featherd out in all brown and drab colors, so we assumed it was female...ds cried and we changed his name to Gertie. Well the other day I noticed that Gertie is getting a green head and a white collar around her neck and is turning grey on the belly area...so Now I do thing it is a male duck after all....! SO, Gary is getting all pretty colors now. As for the pekins.... One is just built different than the other. One had a curly -Q tail feather. I assumed that I had 1 male and 1 female.... They both managed to get thier tail feather sripped off trying to escape the pen and now that they are growing back they both have a curly-q tail feather! (even Gary has one now). I give up trying to gender these ducks! They are silly and driving be batty. Do I put golf balls in the duck box anyway incase I am totally wrong here?? A stange case of the mysterious gender changing ducks!