Local residents of wildlife parks in Kenya often express frustration that international travelers on organized safaris, despite their lack of experience and knowledge, seem to encounter elusive wildlife more frequently than they do. Unlike in a controlled environment, the animals roam freely in a vast natural habitat, and there is no certainty that any visitor will spot a particular species. While it is thought that the success of the international travelers is due to 'beginner's luck', what might actually clarify this situation is the fact that __________..

Which of the following best completes the passage below?