| 1. | The eyes of an emu are protected by nictitating membranes.
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| 2. | Unlike the Calabar angwantibo, the golden angwantibo has no nictitating membrane.
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| 3. | The nictitating membrane acts a sweeping wiper across the eye.
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| 4. | Some reptiles, birds, sharks, and mammals have full nictitating membranes.
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| 5. | The nictitating membrane keeps the cornea moist and clean by sweeping across the eye.
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| 6. | The eyes lack nictitating membranes; the tiny spiracles are located well behind them.
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| 7. | Candicine caused contraction of the cat nictitating membrane.
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| 8. | Unlike the upper and lower eyelids, the nictitating membrane moves horizontally across the eyeball.
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| 9. | Birds can actively control their nictitating membrane.
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| 10. | The eyes are covered by a nictitating membrane which allows the beaver to see underwater.
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