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Sometimes referred to as a “third eyelid,” the translucent nictitating membrane serves to protect it from foreign objects and to moisten the eye while at the same time allowing the bird to retain some degree of visibility.This membrane plays a crucial role in protecting the owl's eyes, especially when hunting or flying through brush. It extends from the inner corner of the eye to the outer corner, and is drawn across the eye much like a windshield wiper. The membrane is thinner and more transparent than the fleshier upper and lower eyelids. While owls use their upper and lower eyelids for sleeping, they rely on the nictitating membrane for most blinking actions.
Saanich, BC.