Parietal Eye

Blue Iguanas have a white photosensory organ on the top of their heads called the parietal eye (also known as the third eye, pineal eye or pineal gland). This "eye" only consists of a rudimentary retina and lens and thus, cannot form images. It is however sensitive to changes in light and dark and can detect movement.

Date Taken: 13 May 2012
Camera: Canon EOS-1D Mark IV
Exposure Time: 1/320s
Aperture: f/8
ISO: 250
Focal Length: 100mm