Mallard (Anas platyrhynchos) is a widespread species so common everywhe that it is probably the best known of the puddle ducks. Only the male has the brilliant green head; females are a mottled tan. A southwestern form used to be considered a separate species called "Mexican Duck" and males of this race resemble females of the widespread form but have yellow bills without the black splotches of regular females (see MALL 051 and 053). All images made in in Phoeniz, AZ area.