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Here's the "head" of Curiosity. The rover's Mastcam includes two cameras (the squares below the white top), one with a zoom lens and the other with a wide-angle lens. NASA had experimented with a last minute change to give it two zoom cameras with 3D capability but the cameras weren't quite ready to take over from the existing ones.
The circle in the white box is the laser sensor which can "zap" a rock about 23 feet away and then determine its composition based on the spark it gives off.
Here's a side view of Curiosity.
Curiosity is raising its arm that features a percussive drill and sample-handling system. It will test samples of fine powder taken from interiors of Martian rocks and deliver them to two analytical instruments inside the rover. The tools at the end of the arm include a color camera, an element-identifying spectrometer, a scoop for collecting soil samples and a brush for cleaning rock surfaces.
The arm can be extended about 7.5 feet and the turret and tools on its arm weighs about 73 pounds.