Opportunity's rover arm at work

This image from the front hazard-avoidance camera, the Hazcam, on the Opportunity rover shows the rover's arm extended for examination of a target called Onaping at the base of an outcrop called Copper Cliff in the Matijevic Hill area of the west rim of Endeavour Crater during the 3,163rd Martian day of Opportunity's work on Mars, December 16, 2012.