I read the "radical but right". In its second paragraph, writer used the quotation "In many cases, humans have 'duties regarding animals that are not at the same time duties to animals' (Feinberg, 2002,p.51)." to explain the topic of this essay, which addresses the question of animal rights. And at here writer used the "Duty regarding animals" compare with "Duty to animals" to stress that although people put some statues to protect animals, they have not remedied the problem, because "the rights that they try to put into effect are not as much as animals truly deserve." Writer choose to present the research material in this way is not only explained her mind clearly by a comparison sentence, it is also let reader think more about if they go a right way to protect animals, and if it is necessary that animals need their rights.
The research gives prominence to the thesis which is "under current laws we have some obligations toward animals, but they do not have right themselves" in this essay. After the research, writer can go easy to explains that why some obligations toward animals does not what animals really wanted, they need rights belong to themselves, it is radical but it can solve problems basically.