Quite hardy - some birds stay as far north as open water is found. The smallest and one of the most common of our ducks. Their tiny size gives the impression of great speed, but mallards can fly faster. Their flight is often low, erratic, with the entire flock twisting and turning as one unit.
They nest as far north as Alaska, and migrate in all four flyways. Early fall drakes are usually still in full eclipse plumage. Drakes whistle and twitter; hens have a slight quack.