Mallards are perhaps the most familiar of all ducks. They can be found Mallards throughout North America and Eurasia in ponds and parks as well as wilder wetlands and estuaries. Mallards are large dabbling ducks, meaning they feed in the water by tipping forward and grazing on underwater plants. They almost never dive. The male has a gleaming green head with a bright yellow bill, gray flanks, and black tail. Photo courtesy of the Jim Serpa Photography Collection.