He don't need no introductory books, Lighter. Origin is a lovely read, even though it's tautly-argued with no flannel. You do have to keep your concentration, a bit like getting the most of hearing a great symphony. You can get versions with pictures to leaven the task slightly. Don't forget, Darwin was writing before the days of the technical language that can befuddle the uninitiated who chance a delve into modern genetics and evolution.

I like the dog turd scenario, Musket. Brilliant! :-)