Hard to confuse with anything else—true to its name, it’s a swan marked by a black neck. Quite common in suitable areas, though sometimes locally distributed, it inhabits lakes, slow rivers, wetlands with open water, estuaries, and sheltered coastal zones. Often seen in groups, with winter gatherings sometimes reaching into the hundreds, and it frequently associates with Coscoroba Swans. The young are white at first, soon showing a dusky neck, and within a couple of months resemble the adults.