'Reared in Chester Zoo' by Janice Madden, is the story of June Mottershead (the daughter of George Mottershead who set up and ran the early zoo) and her life in the zoo from an early age.
I am reading this at the moment and finding it very interesting. I would recommend it for anyone who is interested in the history of Twycross and its animals"Molly's Zoo" by Molly Badham and Nathalie Evans is about how they went from running a pet shop to setting up Twycross Zoo.