?This was my hands down favourite when I was a kid. I have now introduced my worn copy (with the front cover missing) to my four-year old and he is also having fun exploring the pages. There is a certain magic about Dr. Seuss books, but this one in particular has great illustrations which you can literally explore for ages--as my son proves every time I try to read it to him.
In addition to the usual rhymes, there is always a moral to the story. In this one, a young man meets a wise old man in the desert, who tells him about all sorts of weird and wonderful---and unfortunate creatures that have a much more difficult time of it.
I will say that this age and older are probably a more suitable audience for the book. I tried to share it with him a few times in the past, and although there are a lot of fun rhymes, he just wasn't into it a couple of years ago.