How many species of harrier exist in North America?

In North America, there is only one species of harrier, which is the Northern Harrier (Circus hudsonius). This bird is known for its unique hunting style, characterized by graceful flight close to the ground in search of prey. The Northern Harrier is distinguished by its long wings and tail, as well as its distinctive facial disk that helps enhance sound detection, making it an effective hunter in open fields and marshes.

The other options suggest multiple species, which is inaccurate in the context of North American harriers. While there may be several species of harrier globally, the Northern Harrier is the sole representative of this group within the North American region. Understanding the specific identification and behavior of this species is essential for enthusiasts and practitioners of falconry, as it highlights the diversity and adaptability of birds of prey within different environments.