The mallard or wild duck is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa and has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Argentina, Chile, the Falkland Islands, and South Africa.
It inhabits a wide range of habitats and climates and is found in both fresh and salt-water wetlands, including parks, small ponds, rivers, lakes and estuaries, as well as shallow inlets and open sea within sight of the coastline.
Mallards have had a long relationship with humans and almost all varieties of domestic ducks were derived from it. They were first domesticated in Southeast Asia at least 4000 years ago, during the Neolithic Age, and were also farmed by the Romans in Europe, and the Malays in Asia. It is also common for mallards to mate with domestic ducks and produce hybrid offspring that are fully fertile. (source: Wikipedia)