sentences:  Seton was an early pioneer of the modern school of animal fiction writing, his most popular work being "Wild Animals I Have Known" (1898), which contains the story of his killing of the wolf Lobo.He later became involved in a literary debate known as the nature fakers controversy, after John Burroughs published an article in 1903 in the "Atlantic Monthly" attacking writers of sentimental animal stories.The controversy lasted for four years and included important American environmental and political figures of the day, including President Theodore Roosevelt.