Two individuals sited.
Third image is a nice personality picture.
Sorry for the bad pictures
Subject is the bird in front and center. Male, very likely the same individual that has spent the late winter at this location for the past four years or so.
first of the season
Not sure of ID. Some were all black heads. All from Owen Park
About 140 were present, by far the largest flock of this species I've ever seen on Martha's Vineyard. This is just one piece of the flock.
Two birds center in the back, with red-breasted mergansers. Second and third photos show one of those individuals.