| 21. | These demons are capable of concealing their eye colour with a sort of nictitating membrane which makes the eyes appear human.
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| 22. | Some reptiles, mammals and birds have a translucent third eyelid that moves horizontally across the eye called the nictitating membrane.
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| 23. | They have a weakness though; they can be disabled temporarily by very bright lights ( shown by nictitating eyelids ).
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| 24. | These sharks have only 1 dorsal fin, 6-7 gill slits, and no nictitating membrane on the eyes.
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| 25. | Hexanchiform sharks have only one dorsal fin, either six or seven gill slits, and no nictitating membrane in the eyes.
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| 26. | In some breeds of dogs, the nictitating membrane can be prone to prolapse, resulting in a condition called cherry eye.
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| 27. | Lemurs also have a third eyelid known as a nictitating membrane, whereas most other primates have a lesser developed plica semilunaris.
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| 28. | Houndsharks are distinguished by possessing two large, spineless dorsal fins, an anal fin, and oval eyes with nictitating eyelids.
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| 29. | They appear to have a well-developed olfactory system, When the animal completely submerges, the nictitating membranes cover its eyes.
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| 30. | In animals without eyelids, the role is played generally by some other membranes and nictitating membrane .-Dr . Rajarshi, India
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