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Originally posted by Chadwickus
The 'footprints' appear to be too inconsistent for my liking.
Nice find none the less, an idea of the size would help us a lot I'm sure.
Originally posted by Nerevar
It is impossible to place a scale on this picture. The alien could be millimeters tall or hundreds of feet tall. By definition a boulder is an odd shaped rock which means that it will NOT roll in a straight line. Especially if it is rolling diagonally down an incline. From this image it is impossible to tell the elevation, i.e. which direction is uphill and which is downhill.
The OP's guess seems to fit with the popular description of a Grey....interesting...
(edit: to add italics to the word 'alien')
[edit on 25/7/2008 by Nerevar]