White-faced whistling duck vocalizes frequently with distinctive high-pitched, multi-syllabic whistles which sound very unduck-like. Male and female calls differ slightly and may be a bonding mechanism. Its attractive appearance make it a popular bird in waterfowl collections. They are usually in flocks. They spend a lot of time sitting on the banks. Most foraging activity takes place at night; during the day the birds roost near the water, often in flocks of several hundred, and preen themselves and others. Whistling ducks are more arboreal than many other species of duck, spending part of the day perched on a branch. They are fast swimmers but do not dive except for food.