Ok, last spring I got an assortment that included 10 chickens, 2 turkeys, 2 ducks, and 2 geese. I've been able to sex all of them, except the geese! We have a white chinese and a brown chinese. Physically they look similar, same knob size, neck length, etc. Personality wise there are slight differences. The white one is much bolder. He watches us, and keeps his head low honking at us. Meanwhile the brown one is walking around behind the white one just honking. The brown one will lower it's head and take steps towards the dogs occasionally, but it's usually the white one doing all the stalking. I'd like to think the white one is a boy and the brown a girl, but I don't know if I'm lucky enough to have gotten a goose and gander! Does anyone think they could offer any thoughts if they saw pictures? Thanks!