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