is this duck mixed?

[ctomany]

i have 3 other cayuga ducks, this duck looks exactly like them besides the massive poof on the back of her head. would this be a crested duck mixed with a cayuga?

 

[SilverBirds]

He could be mixed, but crests can pop up in any breed.

 

[Rouen Mom]

Ah he/she is BEAUTIFUL!! Yes, crested cayuga. I also have a crested duck. So very cute