Ear Canal Showing!

[Bow8746]

Today after giving my ducklings a bath I noticed one of them had their ear canal showing on the right side and not on the left. I'm pretty certain that it is the ear canal I've done little research but I was wondering why his/her right canal is showing and not it's left.

 

[Amiga]

Could it be that he or she is losing feathers in that area and will be getting some adult feathers soon? How old are they? Do you have a photo?