What is a notable size characteristic of a Ferruginous Hawk?

The correct choice highlights that the Ferruginous Hawk is notably larger than the Red-tailed Hawk. This size distinction is significant as it sets the Ferruginous Hawk apart from one of the most common raptors in North America, the Red-tailed Hawk. Typically, Ferruginous Hawks can weigh between 2 to 4.5 pounds with a wingspan that can reach up to 53 inches, which gives them a robust appearance compared to the Red-tailed Hawk. Understanding this size characteristic helps in both identification and understanding the ecological niche that Ferruginous Hawks occupy.

The other options may not accurately represent the Ferruginous Hawk's well-documented behaviors or classifications. For instance, while it is true that Ferruginous Hawks, like many birds of prey, will defend their nests to some extent, that behavior is not a defining characteristic of the species. Furthermore, while the term 'Parabuteo' refers to a genus of larger hawks that includes the Ferruginous Hawk, it does not highlight a notable size characteristic in the context of this question. Thus, focusing on the size comparison to the Red-tailed Hawk not only provides a clear answer but also enriches understanding of raptor identification.