Consider the pages that you have read, particularly Monday and Tuesday and then write some theories of your as to why certain animals look the way they do. You could use the animals already mentioned in the book or use some that you think of yourself.
For example why does a skunk have a white stripe right down its back?
Or what funny story could you think of for a leopard having spots?
Make it as creative as you can, have fun with it but focus on the punctuation and grammar.