A Camel has two sets of eyelids. The often used during sandstorms Camels have 3 layers of eyelids to protect them from sandstorms and the sun.
Two eyes, two eyelids. Four. We have two eyelids and the other two eyelids are small pink nictitating membranes that reside in the inner corner of our eyes.
It is said mallards have three eyelids per eye. I have never directly observed that. I have only seen one that closes from the bottom instead of from the top.
Rabbits have two SETS of eyelids but three actual eyelids per eye. The external eyelids are like ours - an upper lid and a lower lid, both with lashes and these are used for shutting out light. Between these and the eyeball is a third eyelid which is very pale and lubricates the eye.Yes, they do. They have eyelids and so they blink, although I think not as much as humans personally.
Sharks
4. Two for each eye. They have normal ones like you and I and they have set that come from the bottom of the eye if they are sick or they see an extremely bright light. if the lids from the bottom are always showing, get your cat to the vet right away.Cats have the usual setup of eyelids on each eye (the main one that moves downward and a second that moves upward), plus the 'third eyelid' common to many animals. You may confused with the myth of cats' lives (the number is either seven or nine, depending on where you are).
eyelids and eyelashes
6 - two upper, two lower and two third eye lids. The third eyelid is under the lower lid and serves like a windshield wiper to clear the cornea when the camel blinks. Camels actually have three eyelids! Two of them have lashes, and the third is thin. Camels have three eyelids per eye so they have six eyelids total. The extra eyelids help protect it from sandstorms. The third eyelid is translucent (they can see through it) so their eyes will be covered during sandstorms.
The combination of two sets is the Union of the sets and contains all the elements of both sets.
no i hav3nt s33n th3m
One clear one to see under water and another to completely close their eyes. They have one pair of eyes, with two pairs of eyelids: one regular pair, and an inner eyelid that is transparent called a nictitating membrane, used to protect their eyes when underwater. Sometimes it will be said that they have three eyelids, because you can count the regular eyelids as two, top and bottom, and the nictitating membrane as number three.
The union of two sets.The union of two sets.The union of two sets.The union of two sets.