why do bats have eyes even though they are blind?
106770
Even though they can't distinguish images the eyes of a bat are used to determine relative lighting conditions such as day or night and all hues in between.  This is how they determine if it is night and thus time to feed.
308635
Do you mean a bicycle riding bat? They tend to live longer than other bats because they're keeping fit in one of the most aerobic ways.\n\nHowever, bats do find it difficult to stay in the saddle at speed - this is because they have to spread their wings in order to grip the handlebars - thus as speed builds up they tend to take off. This is why you don't see many cycling bats, most tend to prefer rowing or sailing.
1007824
All insects have 5 eyes.\n\nMany arachnids have 5 or more eyes including spiders and scorpions.\n\nMany mussels such as clams have numerous eyes, often 20 or more.\n\nBox jellyfish have 5-15 eyes.\n\nThe only chordates to have more than two eyes are the jawless fish: lampreys and hagfish. These fish have a third eye located in the middle of the head.\n\nThe tuatara, a reptile from New Zealand has a partially developed third eye in the middle of its head but  it can't actually see with it.
971154
Few mammals have eye sockets that are as well developed as our own.  It's probable that the skull you found once had eyes, but that their placement is not obvious in the defleshed skull.\n\nHere's a picture of an opossum skull\nhttp://animaldiversity.ummz.umich.edu/site/resources/anatomical_images/family_pages/didelphimorphia/didelphidae.jpg/view.html\n\nLooking at the dorsal view, you can see two horn-like projections just anterior to the sagittal crest.  Those are the attachment points for the cartilage that makes up the back of the support for the eyeballs.  In life, the eyes fit in the rounded areas just in front of those horns.\n\nHere's a picture of a skunk skull, http://www.skullsunlimited.com/graphics/spotted_skunk_skull.jpg\n\nYou can see the rounded area where the eyeball sits just in front of the jaw, above the cheekbone.  There's no real socket for the eyes the way there is in a human skull.
963130
It depends on the bird. As a general rule, predatory birds have their vision focussed forward (eg, owls, hawks, eagles) while herbivorous bird have a wider arc of vision, including to the sides of their bodies. (That is, the higher on the food chain a species of bird is, the more likely thay have specialised to see forward of their bodies.) In both instances, the bird's brain combines and interprets the world in a useful way for the bird. They are not 'seeing forwards' or 'seeing sideways' - they are seeing in a way useful for that species. \n\n(As a matter of comparison, human females interpret a wider arc of vision than male humans - hence the reason why men are sometimes described as not being able to find something 'right under their nose'. Women don't "see sideways", their brains just interpret visual information from a wider lateral angle.)
1091082
I believe sunglasses are to prevent sunburn of the eye because it has a thin layer of skin and just like your body skin it is subject to sunburn. So I would say the answer is yes. Even though they're blind they still need to protect their eyes.
334962
Depends on the lighting. Some fish are blind in underground caves and do not see at all. The majority are very aware of their surroundings both with sight and chemical/electrical sensitivity. Sound has an effect with communication. Sight is but one mode of sight seeing. Deep sea creatures are capable of producing artificial light but I do not feel that there is nothing artificial about it. Seeing well is a matter of survival.
178807
There are viper fish, deep sea anglers, and brotulids to name a few. Some are blind but some have bioluminescence, or in other words they can glow in the dark and have huge eyes. They came to live so deep very gradually over millions of years.
902655
I believe so. Their eyes are poor and good basically for detecting motion. It is not correct to say they are blind, though.
43367
Each of the eyes are slightly recessed, and each eye points in a slightly different direction.  This makes it so that depending on which eye detects the most light, the insect is able to determine the direction of the light.  Humans, by contrast, find the location of light by having a lens which focuses the incoming light on the photo-sensitive retina at the back of the eye.
30719
You wouldn't have to.Their senses are better then are's that can see.They probably explain better then us that can see. They don't take all of the senses forgranted.
903885
The answer is D.  Animals with large eyes (think owls) are usually nocturnal.   Larger eyes allow for more light to come in.
1005825
shame poor things had polio so they went blind. this farmers wife she was helping them or at least she thought she was. you see her hubby had leprosy and he caught the mice in the barn stealing his grain. naturally when you find a mouse you pick it up tail first. so they were infected and cried so hard, you know, it was like as if having polio was not a curse enough now we have leprosy! so their request was please help cut off our tails for us and she did. and you know why they say have you ever seen such a funny sight as three blind mice?\n\n mail me and I'll tell you
662376
Many terrestrial invertebrates react to light by moving away from it. This behaviour is intended to protect them from the heat of the sun which would dry them out and kill them.\nIn Science lessons the usual animals used to demonstrate this are Blowfly larvae (maggots) and woodlice.\nThe presence of eyes is not necessary, but some sort of photoreceptor is.
274732
I can't believe how many people actually think there is any truth to this idea. Bats in flight can turn any direction they choose. If that was not true they would never be able to navigate long distances into twisting cave passages to roost during the day. Further, when feeding they are quite aerobatic. Some smaller bats can even hover like a humming bird. When camping I have often used a flashlight shining straight up into the air to attract insects and watch the bats fly through the beam of light to catch the bugs. They turn quickly and in any direction.\n\nI checked the Bat Conservation International website which is maintained by some of the best bat biologists around, and found nothing about this idea.\nhttp://www.batcon.org/home/default.asp\n\nAlso refer to:\nhttp://fi.edu/wright/again/wings.avkids.com/wings.avkids.com/Book/Animals/instructor/bats-01.html
367499
Good question. Not hearing; sight. They seem to be hearing movement, but birds go by sight. I thought the same thing.
24275
The pupil is a circular opening that opens and closes according to how much light it's being exposed to. If too much light is let in you can't see anything at all. I suspect that cats have different shaped pupils because their eyes are designed to be able to see in almost ZERO light.