I've actually done quite a bit of research on this question and given a speech on it (granted, a small, graded, classroom speech) this year.
I've come to the conclusion, given the obscene amount of alleged sightings and whatnot, that yes, they (or something like them) do exist. However, I believe that 100% of photographic evidence, and in fact all forms of tangible evidence, is complete bullshit. And that goes for the Sylvia Browne nonsense, as well. Obviously Montel doesn't bother to google her before he books her on 75% of his shows.
People see things, and it's far too common to count off as nothing. What it is, I don't know. I've never had a decent conversation about it without someone claiming to have seen one - usually it's more than one person.
I've never seen one, and I genuinely feel I never will, but I do believe that there is something externally responsible for what people see. Sometimes.
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