Call Duck

Familiar — but not necessarily understood

Ducks are so familiar that everyone assumes they know them well. Yet most of us have missed a few remarkable details.

Take the classic "quack," for example. Only female ducks make that sound. Males produce a much deeper, raspier call, almost like a whisper. Most people have never noticed the difference.

Bantam size

This is one of the smallest duck breeds in the world. An adult Call Duck usually weighs only 0.5 to 0.7 kg — about a quarter the size of a typical meat duck.

Half-asleep, flying 800 km

A mallard can sleep with half its brain while keeping the opposite eye open, a process known as unihemispheric sleep. Ducks also produce oil that waterproofs their feathers. During migration, mallards can travel as far as 800 km in one day.

At ZooJung

The ducks on Floor 1 gather around a small pond. They are most active early in the morning before 09:00 — "meeting" beside the water, preening, and foraging. It is the quietest moment of the day, before the crowds arrive.

Observation tip: Stand still and listen: which ducks quack, and which make a low, raspy sound? It is the quickest way to tell females from males.

📍 ZooJung — 99 Pham Van Dong, Nha Trang