rouen or mallard?

I notice her bill color is different than Peepingtons mom rouen. Does that signify gender? I have seen adult Mallards and Rouens, and the Rouens are bigger like on steroids. But if you have nothing to compare her with, you wouldn't know.

We aren't sure if she is actually a "she". She just calls her thst becajse she was hoping for a girl and they only had straight run haha, but i would like to know about sexing by bill color too because I would like to know for sure! :)
 

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