Gadwalls are most numerous in the Central Flyway, but not too common
anywhere. They are often called gray mallards or gray ducks. They
are one of the earliest migrants, seldom facing cold weather.
They are the only puddle ducks with a white speculum.
Small, compact flocks fly swiftly, usually in a direct line. Wingbeats
Drakes whistle and kack-kack; hens quack like a mallard, but softer.