杜鹃 (dù juān), commonly known as the cuckoo, is a bird belonging to the family Cuculidae. It is known for its distinctive call, which often sounds like its name. Cuckoos are found in various habitats, including forests, grasslands, and gardens, and are known for their unique breeding behavior, where some species lay their eggs in the nests of other birds. In Chinese culture, the 杜鹃 is often associated with themes of longing and sadness, as its call is heard in spring. The bird is also linked to the legend of the 杜鹃啼血, which tells the story of a devoted mother who mourns her lost child. This connection has made the cuckoo a symbol of love and loss in literature and art.