Even though sharks are among very few fish which have eyelids, they do not blink. Most species of sharks have special nictitating membranes which go over their eyes to protect them when they are hunting or under attack.
moko
A fish that can blink with both eyes is the four-eyed fish. Although its name suggests that it has four eyes, it actually only has two eyes like other fish, but each eye is divided in two parts allowing it to see above and below the water simultaneously.
This happens when you blink.
Cats and dogs blink with both eyes, though sometimes if they wanted to for any reason they can blink with one eye only and leave the other eye open, which is called a wink.
no, their pupils are only very small parts of their eyes, they can make their eyes roll up or inside their head which is their way of cleaning their eyes
There is a difference, a blink is to close and immediately reopen the eyes, usually involuntarily, as when the eyes are affected by strong light. A wink is given, usually with one eye, with the eye closed a little longer that a blink, giving a hint or a signal which may have some sly meaning. Often the head is inclined at the same time at add greater effect. ^^That's true. Blinking is usually with both eyes, and usually in comes naturally. (We have to blink at some point, and it's usually an subconscious act). A wink is only with one eye and is usually meant to signalize something.
no they cannot! they have upper and lower eyelids but they dont move, but they do have a thrid eyelid which is called the nicititating membrane which closes to protect their eyes when biting prey! SO SUCK OUT CHEESTRING YOUR FACTS ARE WRONG! dont belive cheestring facts they lieeeeee
some fish blink but most do not. out of all the fish i have the only fish that can blink are my corydora catfish. and btw they DO sleep too. someone has a lame sense of humorno they dontPuffer fish can blink also
Fish don't have eyelids that can close, so they don't sleep with closed eyes.
Yes. both at the same time ;) *) -A
Koi fish usually have two eyes.
No, camera eyes like all other vertebrates. Mollusks also have camera eyes. Only anthropods and insects have compound eyes.