After receiving a 9:44 AM text alert from an expert birder of a male Common Merganser on the Central Park Reservoir, I wasted little time in going out to look for it. I put on my running clothes and ran the Reservoir, binoculars in hand. I expected to find the bird close to shore in the NW cove, which is where many ducks have been spending time this winter, including rarities like an American Wigeon, seen in late December, and a pair of male Ring-necked Ducks, seen on January 5th. (These ducks are rare for Central Park, though not for the New York City area in general.)
Instead, I did not find any ducks close to shore, where ice had developed. Many appeared to be near the dike on the east side, but a few minutes of scanning did not turn up anything unusual. I was dressed for running, not standing, and so continued on and back home.
Clad in much warmer clothes, I returned to the Reservoir around noon and planned to examine things more closely from the area around the east side pump house. Immediately two large, red-headed ducks appeared in the distance and then were lost amid a contingent of Canada Geese.
I walked west along the southern track and after about 200 yards the red-headed ducks popped back into view, and this time I could see them clearly. Their white chins and necks (along with bills thicker than those of the Red-breasted Merganser), left no doubt that this was a pair of female Common Mergansers!
I followed them for a half hour, thinking they might meet up with the previously-reported male, but they did not and I never saw the male myself.
Common Mergansers are exceedingly rare on Central Park waters. The last eBird records of them were a single observation in 2006 and several sightings in February 2003.
Several weeks ago Common Merganser had been seen off of the NE shore of Randall’s Island. They did not turn up again on any of my visits. I did not expect to eventually see them on the Reservoir.
Common Mergansers prefer fresh water, and I suspect that the unusually cold weather of the last week has frozen the surface of many lakes to the north and put these ducks on the move.
Birders should also be on the watch for Canvasback, both on the Reservoir and also, more commonly, on the Hudson River.