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Title
Close up profile of Great Blue Heron nictitating eyelid #128448418
Description
A portrait face shot of a Great Blue Heron, Ardea herodias, showing third eyelid, or nictitating eyelid. A nictitating membrane is a third eyelid that is translucent or clear. It is used as an extra level of safety for the eye and allows the creature that has it to still see while affording its eyes an additional amount of protection. Photographed in Walton County, Georgia, USA.