What are these ducklings

[kntrybumpkin]

We have 4 of the black ones we are pretty sure they are cayuga then the brown and yellow there are 2 they are identical and we have no idea we bought them at orscheln's along with quite a few Crested ducklings

 

[kntrybumpkin]

this is one of the mystery yellow ones their wing feathers that are growing in have spots on them

 

[kntrybumpkin]

These are the black

 

[kntrybumpkin]

Anyone have any suggestions

 

[Sfraker]

Black are most likely Cayuga
The yellow and brown look like Welsh Harlequin.