Do fish have eyelids?


Fish do not have eyelids, with the exception of the shark. Eyelids are used to protect the eyes from dust and keep them moist; fish do not have these problems underwater, so there is no need for eyelids.

Although fish do not have eyelids, they can sleep. Some float, while others bury themselves or wedge themselves into tight places. Even though they are sleeping, they are still able to sense danger. Fish sleep for as long as they need, depending on how much energy they have exerted during the day.

Fish also lack eyelashes, as they are unnecessary for survival or comfort.

Q&A Related to "Do fish have eyelids?"
A cat has three eyelids, the third eyelid appears when the cats eyes are open. It clears the eyes and protects them from being damaged. Look here for more information:
The main purpose of eyelids is to moisten the surface of the eye, which in terrestrial vertebrates (like you and I) is nessesary to provide the eye with lubrication to move. Underwater
Eyelids are used for blinking which keeps the eyes moist and prevents them from drying up and
Evolutionarily, we have eyelids because our ancestors have eyelids. Eyelids are in our lineage going back down to the early terrestrial vertebrates. The main purpose of eyelids is
1 Additional Answer Answer for: do fish have eyelids
Most fish do not have eyelids.
Some sharks do retain a third, thin eyelid called a nictitating membrane.
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