| 11. | The eyes are large and circular, with nictitating membranes ( protective third eyelids ).
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| 12. | Instead the eye is lubricated by the nictitating membrane, a third eyelid that moves horizontally.
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| 13. | The eyes lack a nictitating membrane.
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| 14. | There is no nictitating membrane and the cornea is continuous with the skin surrounding the eyes.
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| 15. | The "'nictitating membrane "'of a Masked Lapwing as it closes.
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| 16. | The nictitating membrane also covers the eye and acts as a contact lens in many aquatic birds.
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| 17. | In addition, glands on the nictitating membrane secrete a salty lubricant that keeps the eye clean.
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| 18. | The Calabar angwantibo is the only primate to have a functioning nictitating membrane ( third eyelid ).
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| 19. | The irises of the eyes are golden to brown, and the transparent nictitating membrane is pale blue.
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| 20. | The millisecond before contact with wood a thickened nictitating membrane closes, protecting the eye from flying debris.
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