Are these Cayuga ducklings?

[DuckyLou]

I got these 4 baby ducks when they were one day old. The lady said they were Cayuga ducks. They are 5 weeks old now and one of them has a crested head? I think that's what it is called and it's turning a creamy color on its chest and around its neck. Is this normal for a Cayuga? I really don't know very much about this breed, obviously ... Haha. Are these full blood Cayuga or mix or something else completely? Thanks for any help!
Well it's not letting me upload my pictures... I guess maybe someone might know just by what I described maybe?
One has a black body with a creamy colored chest and neck and a crested head, the other 3 are black body with a very small amount of a creamy color only on their chest. I will try to post pictures again here in a little bit!

 

[country_girl011]

Cayuga will be solid black
no white

 

[DuckyLou]

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[DuckyLou]

 

[DuckyLou]

It finally let me upload my pictures! That's what I thought, that Cayuga was solid black. I wonder what these are then??

 

[Miss Lydia]

Maybe? these are blk swedish

 

[learycow]

Nope, not pure cayugas.
Pure will be solid black with black bills and legs/feet.

Those look like poorly marked black swedish, or crosses. Swedish can have crests like that too.

 

[Miss Lydia]

It finally let me upload my pictures! That's what I thought, that Cayuga was solid black. I wonder what these are then??

They are awfully cute.

 

[maxpedley]

balinese crested ducks i would say

 

[Finny]

Nope, not pure cayugas.
Pure will be solid black with black bills and legs/feet.

Those look like poorly marked black swedish, or crosses. Swedish can have crests like that too.

I agree. Either cayuga mixes or black sweedish.