Rouen or Mallard?

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I picked up these two yesterday from Tractor Supply where the lady said they were mallards, but they appear to have the double stripe. Well, one does and the other has what seems to be interrupted stripes. Opinions?

 

[Brahma Chicken5000]

@MillersFarm will know

 

[MillersFarm]

Very adorable Rouen ducklings~

 

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Oh thank you! That's what I thought, but these are my first babies so I was undoubtedly doubtful hehe