Sexing 3 newbies

[Freie Family Farm]

We are possibly getting 3 new ducks for our flock next weekend. I know they are 2yrs old. I also know they are a mallard and 2 are swedish. One is clearly a male and im thinking the other 2 are female but just wanted to be sure...

 

[cheezenkwackers]

The first two appear to be male. Obviously the first one but the second has a drake curl. He is pretty whatever mix he is. The third could be female but I have had drakes without a curl.

 

[Freie Family Farm]

The person knows for a fact at least 1 is male and 1 is female. They were unsure of the 3rd