In North America, Mallard breeds from north-central and southwestern United States north to northern Alaska and the Northwest Territories excluding the Maritimes and eastern Arctic. Winters mainly from southern Canada south to central Mexico; also on the Pacific coast north to the Aleutian Islands. Also resident in Eurasia.

Status in British Columbia
Common to very abundant migrant. In winter, common to very abundant on the coast; locally common to abundant in the southern interior; locally rare to uncommon in the northern interior. Widespread breeder.

The Mallard breeds in wetlands throughout British Columbia from sea level to 1,300 m elevation. Habitats include sloughs, marshes, lakes, swamps, islands, and riparian woodlands. In urban and rural environments, parks, golf courses, ditches, agricultural fields, vacant lots, and private yards are used wherever fresh water is near. The Mallard is a solitary breeder, but loose aggregations of up to 14 nests have been found on small islands near Creston. Most nests were shallow depressions in the ground filled with various quantities of down and loose accumulations of leaves, grasses, needles, sedges, or mosses. Sizes for 355 clutches ranged from 1 to 24 eggs with 52% having 8 to 10 eggs.

The Mallard is the single most important game duck in British Columbia, and hunting seasons are planned around its migration and seasonal distribution. About 100,000 (55% of the duck harvest) are taken in British Columbia each year.

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