I know this is vague but... I remember my Philosophy teacher using a children's book as part of a lesson once. It was aimed at maybe 3-5 year olds and it was an illustrated book where animals were the protagonists. Can't really remember any other details other than it was part of a series of books, not a stand-alone.
I now have a DC of my own and I would like to find this book and buy it for him! Can anyone help?