Since the summer is loaded with repeats anyway, why not give a little attention to this Nature repeat from a few years ago. As a young man, I spent one summer mapping the Everglades as a member of the U.S. Geological Survey crew, so I’ve always been fascinated by the plant and animal life in the Glades. This hour looks at a species that is thriving in the Everglades, but isn’t native to the region: It’s the Burmese python, a snake so big, and so tough, that it can swallow an alligator whole.