Best Known for "The Giving Tree", Shel Silverstein actually wrote many other fine books and poems for children. Amongst his other books
Uncle Shelby's ABZ Book · Lafcadio: The Lion Who Shot Back · Don't Bump the Glump!: and Other Fantasies · The Missing Piece · Runny Babbit
This animated video is narrated by Shel Silverstein himself. The quality of the sound isn't great, but I have not found a better version on the net.
I found this video also on youtube. I think this is an adaptation of a poem by Shel Silverstein, but I have not managed to discover what book it is from. If anyone knows, please send me a note!
Another animated poem of Shel Silverstein read by him. This one is from the "Where the Sidewalk Ends" collection.
You can find a few other poems animated and read by Shel Silverstein here.