The Common Cuckoo (Cuculus canorus) is a migratory bird found across Europe and Asia. It is known for its distinctive call, which sounds like "cu-coo." Adult cuckoos are grayish-brown with a long tail and pointed wings, making them agile fliers. They typically inhabit open woodlands, grasslands, and gardens. One of the most interesting behaviors of the Common Cuckoo is its brood parasitism. Instead of building its own nest, the female lays her eggs in the nests of other bird species, such as warblers or thrushes. The host birds then raise the cuckoo chicks, often at the expense of their own young.