Ducks have three eyelids: an upper eyelid, a lower eyelid, and a nictitating membrane that acts like a protective third eyelid.
camel
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.
Yes, cats have two pairs of eyelids. The inner pair, called the third eyelid or nictitating membrane, helps protect their eyes and keep them moist.
no they dont have eyelids
Dogs actually have 3 eyelids.
Llamas did NOT originate in the United States. Llamas came from S. America
Three
three
Ducks have three eyelids: an upper eyelid, a lower eyelid, and a nictitating membrane that acts like a protective third eyelid.
Three
camel
llamas travel about thirty miles in the day and about three miles at night so overall alot of miles
llamas travel about thirty miles in the day and about three miles at night so overall alot of miles
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.
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.
Three. They have the upper and lower lids, similar to humans. They also have a third membrane that acts as an eyelid, so to speak. The third "eyelid" moves from the outside edge to the inside edge.