WTF Moving Rocks on Mars?

Well here is evidence of something strange on Mars.  What may you ask?  Look closly and you will see the rocks in the background are moving! The rocks! I have seen lots of crazy things on Mars and nothing has had me as confused as these pics do.  How can it be?  You can find the original photos here and a more in depth description of the anomaly http://www.bookofresearch.com/mars-anomalies.htm Happy UFO hunting!