Which species is most likely to occupy and defend the largest territory?

The Gyrfalcon is known for occupying and defending the largest territory among the species listed. This behavior is linked to its hunting style and ecological needs. Gyrfalcons are powerful birds of prey that require substantial hunting grounds to find enough food to sustain themselves, especially since their primary prey can vary in abundance across different regions.

Additionally, Gyrfalcons tend to inhabit remote and expansive areas, often in Arctic and sub-Arctic environments, where food resources can be dispersed over large distances. To ensure their survival, these raptors establish larger territories compared to smaller or less resource-demanding species.

The other options tend to have smaller territory sizes due to various factors, including their hunting habits, preferred habitats, and prey availability, which might not necessitate the same size of territory as a Gyrfalcon would need for successful hunting and breeding.