Why could the peregrine be referred to as the world's most successful hawk?

The peregrine falcon is often considered the world's most successful hawk primarily because of its wide distribution across nearly all continents, excluding only extreme polar regions and a few remote islands. This extensive range indicates its adaptability to various environments, from urban areas to remote wilderness. The bird's ability to thrive in diverse habitats contributes to its status as a successful raptor.

While factors such as reproductive success and prey diversity are important, they do not encapsulate the overall success of the species as effectively as its global presence. Other options suggest certain aspects of the peregrine's biology or ecology but do not align with the broad concept of success in terms of survival and adaptability across multiple geographies. The peregrine's remarkable adaptability and ability to thrive in varied conditions are what ultimately define its success as a species.