You think? Even with the "afros" and some white chest speckles? I see they are growing some blue-green feathers, but they don't look like any pics of "baby Cayuga ducks" that I've googled. I'd be over the moon if they turn out to be, though!
yep any breed can be crested, just keep a close eye on them for issues related to having the crest
GrahamQuackers it is important that you do not breed male and female crested ducks. It's a genetic abnormality and if the defective gene is inherited from both parents, the defect is not compatible with life. It's a tragedy to have 25% of your fertile eggs develop but the embryo die in the shell.Your ducks are beautiful
you might want to read this info in case your not aware of the issues crested ducks can have,
https://www.backyardchickens.com/threads/the-truth-behind-crested-ducks.707110/
If you have done so yet I would get them on a good niacin supplement Nutritional yeast is a good one 1 tab per cup of feed.
Thanks so much for all the info. I definitely did not set out to get crested ducks the way we ended up getting them and I totally did not realize that they had health issues until way after the fact and I wasn't really interested in finding a new place for them to go after we dispense so much time and effort caring for them. But right now our main priority is getting them s**** to determine if we do need to find new homes for some, as I don't reckon there's a whole lot we can do to prevent them from mating
I am taking the four of them to our local farm vet next week to "see what we can see". I wonder if someone out there might be willing to trade us a non-crested Drake for a crested one 
The ones in the top picture look like they could possibly be black swedish. If not, then Cayuga
