I saw four of these ducks on one of the smaller retention ponds in the neighborhood this morning. (Chapel Hill, NC) I couldn't ID them when I saw them, but got a few OK long range photos. I went through a few of my bird books without and luck and then used the ID feature on Merlin. It had some initial problems identifying the bird as well, but I finally found a decent image of the duck and Merlin ID'd it as a Ring-necked Duck. Merlin also ID's it as a rare bird for around here, so I'd really like a second opinion before I post it on my eBird checklist. Thanks!