What kind of ducklings are these?

[drwhite718]

Can anyone help tell me what kind of ducklings I have here? 7 babies. Any way to tell the sex of them right now? I got them at a local supply store

 

[lomine]

They look Black Swedish (black with yellow chest) and Roeun. You can't tell sex at this stage. Between weeks 4 and 6 their voices will start to change and you'll have a better idea then. Girls will quack and boys will make a raspy sound.

 

[TLWR]

Black Swedish and mallards. They have one solid eye stripe and are smaller than the swedish