Ring-necked duck

Ring-necked duck by ricmcarthur
Ring-necked duck, a photo by ricmcarthur on Flickr.
I've not seen the ring aroung the neck.
It does have a ring around its bill.
So, why isn't it the ringed bill duck?

Aythya collaris
Peaked head, dark back, pale spur on sides behind neck, gray on the sides

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