Because we have the proof. Now a common site around our fair city, the black-bellied whistling duck, formerly known as the black-bellied tree duck,is a waterfowl species easily recognized by its striking bright pink bill, long pink legs, chestnut-brown body, and contrastingly dark black belly. This species is highly unique for its distinct vocalizations and behavior of perching high up in trees, as many of us have witnessed. Did you know they form lifelong, monogamous pair bonds and actively share parenting responsibilities, with both the male and female selecting the nest, incubating their eggs, and raising their ducklings?