Animals go extinct, places too. And stories change. Boaz, a small village in Richland County, Wis., has only 156 people these days. There are a half-dozen streets, a couple of taverns, a small park with a baseball diamond and, on the outskirts, a historic marker describing the village's lone claim to fame: "the Boaz Mastodon." The story on the marker is the one that's been told to schoolchildren for almost a century as they stare up at the mastodon skeleton, enshrined in the University of Wisconsin-Madison Geology Museum. It is a story that, until now, has endured largely unchanged: One...