Dallas, TX (WFN) -- A cryptozoologist has an explanation for why no one has been able to catch elusive creatures like the Loch Ness monster and Bigfoot: Because they're not of this earth.

Nick Redfern believes the monsters are not part of the physical world, but instead fall in the paranormal realm.

Redfern and two other researcher buddies took a six-week whirlwind tour of known sighting areas in England and questioned locals as well as tried to track down devil dogs, lake monsters and ape-men.

What they found is that many of the so-called sightings took place near ancient stone circles -- similar to Stonehenge -- which leads Redfern to conclude that they are part of the paranormal and can not be captured by physical means.

He theorizes cryptozoologists may have to develop new methods of research, similar to the way ghost hunters use infrared photos to detect haunts.

Redfern's exploration is detailed in his new book "Men Seeking Monsters" (Simon & Schuster).

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