By Pennsylvania, I had heard that there were sightings of a giant bird in a feild out in Pennsylvania. If I'm not mistaken, that's where one of the 9/11 planes crashed.

Well I think there maybe just more then one, I here all sorts of stories about mothman and its never in the same place, if "their can only be one" (yeah movie quote of the day) then mothman is a very talented anarchist, bad luck charm, symbol of evil, etc.

of course there is different types.

Some of them may have been the same thing, but I doubt there's just one. Quite the world traveller if it is...

I mean either the same entity or the same species, really. i'll accept either.