This series of photos would seem to represent the forepart of the neck (typically 10 feet long and 1 foot thick, or less in the same proportion) doing the regularly-reported arching over fishing movement. this action has been compared to the motion of an inchworm.
underwater photo of the neck of the Loch Ness Monster: the photo also shows the thicker and thinner segments of the neck, although the foreshortened perspective makes this harder to see. This photo is reversed.
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