This video, taken by the Navigation Cameras, or Navcams, on the Mast of NASA's Curiosity Mars rover, shows the rover's robotic arm as it rotates to take a selfie. A camera at the end of the arm captured 86 individual images that were later stitched into a panorama. The Navcams are black-and-white cameras generally used to help engineers plan Curiosity's movements. Animation available at https://photojournal.jpl.nasa.gov/catalog/PIA23625