Welsh Harlequin Ducklings...supposed to be 3 females, but i'm concerned that 2 are males

[Laura]

Hi everyone,
I have had chickens for 7 years now, but am brand new to ducks. We ordered 3 Welsh Harlequin females from Metzer. Hatch date is Aug 11, 2014, arrived at our house 3 days later. They all 3 have looked pretty different from each other from the get go. In the pic below, left to right, Daisy, Rose (in the back), and Buttercup.

Now that they are over 3 weeks old, one for sure (Daisy), and maybe another one (Rose), has started developing a dark head. Daisy in particular has a dark head with a distinct line around the neck where the dark color ends and it switches to light colored. Here are Buttercup who is female I think (front) and Rose who maybe is male but maybe female (back):

And here is Daisy, the one that seems most likely male:

We really only wanted females for eggs. I can handle one male, but two?! If anyone has any input, it is greatly appreciated!!
Thanks so much,
Laura

 

[Amiga]

Who is quacking?

 

[Laura]

The only thing I hear from them is the peeping sound that they've made from the beginning. Today, when they were alarmed, one of them (Rose) made a sort of honking sound. Other than that it's just peep peep peep.

 

[Amiga]

My girls started honking, then got more of an Ah Ah Ah sound - rarely do they actually quack.