what kind of duck is this?

[suenotto]

The 2 very small ducks that look like mini swedes (grey one on the left, black on on the right) what do you think they're mixed with? calls? There is a standard fawn and white runner to the right of the black one and a standard size swedish to the left of the grey one in the foreground. Can calls interbreed with standard size ducks?

 

[Alicia G]

Id say they are swedish call mix.calls come in a bibbed pattern (like what a swedish looks like)but they look to big to be pure call.
Very pretty birds