Which of the following birds can an apprentice falconer own legally?

An apprentice falconer is legally allowed to own certain species of birds that are suitable for training and hunting, and the goshawk is one of those species. Goshawks are known for their agility, strength, and hunting skills, making them a favored choice among novice falconers who wish to practice and understand the intricacies of falconry.

While the other birds listed might be interesting, they are not typically classified as suitable for apprentice falconers under legal regulations. For instance, the flammulated owl, being a non-hunting owl species, does not fall under birds permitted for flight training or hunting in falconry. Similarly, the northern harrier and Swainson's hawk may require advanced skills or specific licenses that apprentices do not yet possess. Thus, the goshawk stands out as the correct answer, aligning with the legal guidelines for apprentice falconers.