This is kind of amateur feeling and awkwardly paced for a documentary, but it's unnecessarily comprehensive if you're interested in the Mothman and want to hear everything there is to know about it.
One of the weirder monster stories, so if you want to hear all about it this is a good one to watch. Somehow, I think "The Mothman Prophecies" failed to cover it. Probably because the director that the idea of the Mothman was stupid. So why did he make a Mothman movie?