Strange! (a GIF-Movie by Tim Beech)

This sequence (showing something that appear to be some sort of "strange movements" near a semi-buried Martian rock) is cropped from the last 10 (ten) frames of a video taken on Sol 6 by the Lander for the Mars Pathfinder Rover.
This possible evidence of unual movements on a world that should be totally still (but we know that is not!) was discovered by Mr. Tim Beech, which I personally thank for the work he made.
The intriguing detail, however, is very hard to be seen nere, but if you know how to look and study a series of pictures, I'm sure you'll find it. Good Luck anyway!