Ducks are rarity which do visit Peninsula Malaysia. They are categorises as vagrant and Mallard is one of them. I have yet to see any sighting in Malaysia except the domesticated one that origin from this species. The photos I shot are in Jeju Korea whilst holidaying in December 2015.
Mallards usually occur throughout North America and Eurasia in ponds and parks as well as wilder wetlands and estuaries. The male’s gleaming green head, gray flanks, and black tail-curl arguably make it the most easily identified duck. Mallards have long been hunted for the table.
Male Mallards (as in top picture) have a dark, iridescent-green head and bright yellow bill. The gray body is sandwiched between a brown breast and black rear. Females and juveniles are mottled brown with orange-and-brown bills. Both sexes have a white-bordered, blue “speculum” patch in the wing.
Mallards are “dabbling ducks”—they feed in the water by tipping forward and grazing on underwater plants. They almost never dive. They can be very tame ducks especially in city ponds, and often group together with other Mallards and other species of dabbling ducks.
Mallards can live in almost any wetland habitat, natural or artificial. They are monogamous and paired for life but the male do have "extra marital affairs" lol. Look for them on lakes, ponds, marshes, rivers, and coastal habitats, as well as city and suburban parks and residential backyards.