First time duck owner. My 4 muscovy ducks all hatched around 5/23 so not quite 2 months old. One is huge - obviously a male. One is small obvious female. However the other two have me stumped. Both are bigger than the small female - one a quarter size bigger - the other - bigger than that one but none as huge as the big one. The feet are both bigger than the small one but not enormous, kind of these two are the same size feet. The tale of one is bigger. Are they like humans - all sizes? Or, is the one just small? I know after everyone is done growing it will be more obvious to me - like my chickens are but as a newbie are there any other markers?