Note the puncture (arrow) in the left front wheel, as imaged by MAHLI on sol 566 (March 10, 2014). A view of this same wheel taken back on sol 513 (January 15, 2014) shows the tear has changed little over the last two months of driving.
NASA caption: NASA’s Mars rover Curiosity acquired this image using its Mars Hand Lens Imager (MAHLI), located on the turret at the end of the rover’s robotic arm, on March 10, 2014, Sol 566 of the Mars Science Laboratory Mission, at 16:51:56 UTC.
More Sol 566 images (from all cameras), and the rover’s latest location map.