A snakeskin found on a picturesque riverbank in the northeast United States belongs to an anaconda—the latest twist in the baffling story of “Wessie,” a supposedly enormous snake that has become a local legend in the town of Westbrook, Maine. Sightings of the snake began in June, when a woman filed a report with the Westbrook police department claiming to have seen a snake as large as a truck, with a head the size of a basketball.