Book One: The story focuses on a family of anthropomorphic rabbits. The widowed mother rabbit warns her four rabbit children, Flopsy, Mopsy, Cottontail, and Peter (the youngest rabbit child) not to enter the vegetable garden of a man named Mr. McGregor, whose wife, she tells them, put their father in a pie after he entered. Her triplets (Flopsy, Mopsy and Cottontail) obediently refrain from entering the garden. Peter's older sisters (Flopsy, Mopsy, and Cottontail) were good little bunnies and went down the lane to gather blackberries. But Peter enters the garden to snack on some vegetables.Book Two: The book is a sequel to The Tale of Peter Rabbit (1902), and tells of Peter's return to Mr. McGregor's garden with his cousin Benjamin to retrieve the clothes he lost there during his previous adventure. In Benjamin Bunny, Potter deepened the rabbit universe she created in Peter Rabbit, and, in doing so, suggested the rabbit world was parallel to the human world but complete and sufficient unto itself.