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A subspecies of the Mallard called the “Mexican Duck,” Anas platyrhynchos diazi, occurs in parts of Arizona, New Mexico, Texas, and Mexico. Both males and females closely resemble female Mallards, although the body color is somewhat darker than a typical female Mallard. Mexican Ducks were once thought to be a full species, but they hybridize extensively with typical Mallards in the northern parts of their range.
Due to those first 5 words above I'm thinking DFW would count them as Mallards. If that is one even.
(source: {scroll to bottom of page} https://www.allaboutbirds.org/guide/Mallard/id )