Which writer routs rabbit story in 6 years?

The story you're referring to is likely "Watership Down," written by Richard Adams. The novel, published in 1972, follows a group of rabbits seeking a new home and has gained significant acclaim for its intricate storytelling and themes of survival. Adams spent over six years researching and writing the book, drawing on his experiences and knowledge of nature. The work has since become a classic in children's literature and is beloved by readers of all ages.