I got 2 baby ducklings from TSC out of the assorted duckling bin and they are either mallards or rouens. How do you tell the two breeds apart? Also how big of an area in my 12X16 shed do they need for the 2 of them? P.S. My camera's broke right now so i can't take pics They're so cute..... Once my camera is fixed i'll take some pics of them. Also i'm a new duckie mama so is there anything special i need to do? Thanks !Shkittles!