“Mastodon seems like a kickass metal name until you realize that the now-extinct American Mastodon was a hell of a lot like a manatee with legs. A member of the Proboscidea family (like its cousin the Wooly Mammoth), the mastodon stood almost ten feet tall and weighed in at roughly five tons-- surely a big beast by any measure. Lacking the killer instinct of its contemporaries, the Sabre-Toothed ti”