Circus cyaneus, commonly known as the Northern harrier, is a bird of prey that inhabits the open fields and marshes of North America. It is also known by several other names, such as the marsh hawk, the hen harrier, and the American harrier. The Northern harrier is easily identified by its long wings and distinctive white underside. It is a skilled hunter, feeding primarily on small mammals and birds. The harrier is also known for its unique hunting behavior, as it glides low over the ground in search of prey. Despite being a common sight in many parts of North America, the Northern harrier remains a fascinating and mysterious bird to many.