how can you tell the difference in mallords and rouen ducks???

[Kendell]

i have two ducks male and female i believed there mallord but some people are telling me they could be rouen so how can i know what they really are mallord or rouen???

 

[Miss Lydia]

i have two ducks male and female i believed there mallord but some people are telling me they could be rouen so how can i know what they really are mallord or rouen???

Size for one Rouens are large Mallards are small. if you google the 2 breeds you'll see the difference immediately.