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Parson's chaemeleon (Calumma parsonii) eye. The chameleon's eyes can move and focus independently to watch two objects simultaneously. This also allows them to have a full 360 degree visual arc around their body while remaining completely still. Photographed in Andasibe-Mantadia National Park, Madagascar. (KEYSTONE/SCIENCE PHOTO LIBRARY/ALEX HYDE/SCIENCE PHOTO LIBRARY)