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What Loch Ness Monster?,
This review is from: The Loch Ness Monster: The Evidence (Paperback)
"The Loch Ness Monster" is a detailed evaluation of every photographically supported sighting of the loch's alleged denizen since 1933. Campbell offers the most plausible explanation of each, and concludes that none survives close inspection. While he lists the ancient mythology that has been retroactively postulated as evidence for Nessie's existence, he finds that it is nothing more than a desperate ploy to reinterpret older fairy tales as earlier sightings.
If Nessie exists, then its ancestor must have entered Loch Ness at some time in the past, when there was a tunnel from the loch to the open sea. But since Loch Ness is 16 meters above sea level, any tunnel large enough to take Nessie would drain the lake down to sea level. There is no tunnel, and probably never was a tunnel. And for the creature to have survived for centuries, there would have to be a breeding herd of at least twenty individuals. But Loch Ness is too cold to support any cold-blooded species, and also does not have the capacity to feed such a number of large lifeforms. Campbell shows that all alleged positive results of sonar, radar and photographic imaging, on close inspection, in fact prove to be negative. Not only does the loch not have the capacity to support a herd of monsters. No legitimate evidence exists that it does contain them. And given the thousands of man-hours devoted to loch watching by serious researchers, photographers and tourists, the logical conclusion is that, if Nessie existed, someone would have proven it by now. But the more Loch Ness is watched, the less the alleged monster shows itself.
Campbell concludes that there is absolutely no reason why anyone should believe in lake monsters. If anyone doubts that conclusion on the basis of any specific evidentiary claim, the chances are that it is one of the dozens of claims that the book examines and demolishes.