These Black-Bellied Whistling-Ducks are beautiful and fun to observe as they live their lives. They “whistle” as they fly by with a high-pitched noisy sound. They have sharp claws that allow them to nest in tree cavities like Wood Ducks and are sometimes called Tree Ducks. Black-Bellied Whistling-ducks are monogamous and share the duties of creating a nest, incubating their eggs and raising their young. They are so colorful and cheerful, it’s hard not to smile when you see them!