I listened to the audiobook (cassettes) and the copyright date was 1995. Adult, nonfiction book. Marvelous information about animal behavior. Not a recent book, but still current. Many renowned animal behaviorists are mentioned in the book, as are many famous animals in their own right, such as Koko the gorilla, Alex, the African Grey Parrot, Washoe the chimpanzee, etc. I am very glad I read this. Was not a fast-moving book, but one to relish. Good for trip in the car, where you could give your attention to the topics discussed. Certainly on a par with Jane Goodall's books.