New to ducks help!!!

[afranks21]

. I have 5 Khaki Campbell's and a mallard. (A friend of mine is a vet and had someone drop him off there because it wasn't the Easter gift they thought it would be and I can't say no). The picture I have attached is a khaki Campbell. Is this a drake because he looks different then my other and his body stature is a weeee bit different. The other walk a little more upright like Indian runners.