Aylesbury

This duck breed was one of the first to arrive in the United States from Europe. Aylesburys were exhibited in 1849 at the inaugural poultry show in Boston, Massachusetts, and were included in the first publication of American Standard of Perfection published in 1874 by the American Poultry Association. The Aylesbury duck has pure white plumage, white skin, (a unique attribute since most ducks have yellow skin) orange feet and legs, dark grayish-blue eyes, and an unusually long, straight pinkish-white bill. It has a long body, horizontal carriage, and a characteristically straight, deep keel that nearly reaches the ground. The Aylesbury is described as slow-moving, and exceptionally tame.
Could not find great info on sizes, but they are a larger breed, weighing between 10-12 pounds (4.5-5.4 kg)
Aylesbury ducks are critically endangered.