what is the gender of my Muscovy ducks

[TeamRetic]

I bought these 2 Muscovy ducks last month, but I don't know the gender of these ducks. One is slightly bigger then the other. They were hatched on the second of April. Here is some pictures of my ducks.

 

[nanaluvsgps]

in the second picture the one on the left looks male and the one on right looks female