Crested Pekin Duck Anas platyrhynchos domestica

The Pekin duck, or Long Island duck is a breed of domesticated duck used primarily for egg and meat production. It was bred from the Mallard in China. The ancestors of those ducks originated from the canals which linked waterways in Nanjing, not Beijing, and originally had small bodies and black feathers. The White Crested Duck is pure white with orange feet and bills. Their appearance is much the same as the Pekin except for their large crest of feathers on the top of their head.

Factsheet: http://www.birdlife.org/datazone/speciesfactsheet.php?id=435