The Central Park Zoo maintains the largest public collection of sea ducks in North America. Included in their collection are three species of eiders: Spectacled, Pacific Common and King.
The Central Park Zoo also houses Red-breasted Mergansers, Scaley Sided Mergansers, Radjah Shelducks, Plumed Whistling ducks, Harlequin ducks and Smew.
In total the zoo has 27 species of waterfowl and has had a very successful breeding program. These ducks can be seen throughout several habitats at the zoo including Eider Beach (next to the Penguin House), Temperate Stream (in the Crane exhibit), Tisch Children's Zoo, the Tropical Aviary and at the Stork exhibit (across from the Snow Leopard).
Here are pictures of just part of the collection:
