I have three ducks who are 6 weeks old and I would like to know what gender and breed they are. One is a creamy-white color with a yellowish orange beak. One is grey/brown/black with a blackish grey beak. The last one's back, top of neck, and top of head is black and its belly, chest, and bottom of neck is yellow with a black beak. The first one (the fully white/cream one) is a bit bigger than he other two.