are all animals color blind??? how do we really know?
398354
There's a peak absorbance of rods and cones in the retina.  Humans have three peaks which represent the primary colors (for light) red, green, and blue.  The colors we see are our brain's interpretation of input on those three colors plus general light level input from rods.  Based on the numbers of rods and cones and the absorbance spectra of the different cones, researches can get an idea of the color vision of different animals.\n\nMost mammals are dichromatic (two colors).  Note how non-colorful they tend to be.  Certain primates are trichromatic (three colors).  Birds, reptiles, amphibians, and insects are also trichromatic or more.  Note how colorful they tend to be.
470322
Chickens, being primarily diurnal (day living) birds (a group that tends to have good vision and colour acuity) probably have at least some ability to distinguish colour.\n\nThe usually drab markings of most chickens (especially wild Galliformes like grouse) are probably more for camoflage than due to an inability to see colour.  There are some Galliform avians that definitely have bright plumage for mate attraction, indicating that colour vision is present in those species (most notably Pavo cristatus - the Peacock), so it's likely that chickens can too.
831547
The color which you are seeing may look differently to other person.\nIt depends on how eyes recieve the color and how the brain interprets the signals.\n\nThis is very difficult to answer. if one can be made to work with more than one brains, then probably, it can be answered correctly!!!
270283
The tapetum lucidum (note the spelling) has different characteristics according to the species. The color reflected depends on its structure but also on the color of the iris. \nFor instance, some bony fish, crocodiles, and marsupials have retinal tapeta (plural of tapetum). In other vertebrates the tapetum is in the choroid and may be formed by guanine (sharks), cells with refractive material (carnivores, rodents, cetaceans), or extracellular fibers (cow, sheep, goat, horse). The color varies with species, age, and amount of pigmentation in the eye and skin (including fur color); see figure 2 in the paper at the link.\nSo the answer is yes, there are different colors of tapeta lucida; and no, the red color is not an indication of "wild" animals. In fact, many animals that are diurnal and lack a tapetum lucidum (for example primates, squirrels, birds, pigs) show a red or orange reflection. \n\nSee this review article (free access) for more information:\nhttp://www.blackwell-synergy.com/links/doi/10.1111%2Fj.1463-5224.2004.00318.x
1138661
There is no way to determine the sex just by looking, you would have to observe its behaviour in the wild.  Also a vet would be able to tell using a DNA test.
871649
That is a very interesting question.\nno . . . . but there is one exception\nIn a camera flash, the light is reaching through the pigmentation\nto the retina, the light-sensitive membrane covering the back wall of the eyeball, which is the color red.\nthe only organisms that have eyes visibly red are ones that are albino\nalbino organisms have less melon(color) in there skin, hair, and eyes.\nresulting in the clear vision to their retina, which causes their eyes to be the color red.\n(i.e. white mice that have red eyes)
1180688
If you are asking if other animals are concerned with how they look your answer is "of course". Think of any kind of male trying to attract a mate (peacock being an excellent example!). They try to have the biggest tails, brightest colors, or whatever will give them the best mate. if you are asking whether or not they can recognize themselves in the mirror, some apes can since they are so intelligent but so-called "lower mammals" cannot since they lack the brain capacity.
7427
You take a test at the eye doctor.  Color blind people generally only lack the ability to see certain shades of a color like purple for example.  They wouldn't be able to differnciate between a sheet of blue and a sheet of purple paper.
967941
What colorblindness is:\nColor blindness (color vision deficiency) is a condition in which certain colors cannot be distinguished, and is most commonly due to an inherited condition. Red/Green color blindness is by far the most common form, about 99%, and causes problems in distinguishing reds and greens. Another color deficiency Blue/Yellow also exists, but is rare and there is no commonly available test for it. \nDepending on just which figures you believe, color blindness seems to occur in about 8% - 12% of males of European origin and about one-half of 1% of females. I did not find any figures for frequency in other races. Total color blindness (seeing in only shades of gray) is extremely rare. \nThere is no treatment for color blindness, nor is it usually the cause of any significant disability. However, it can be very frustrating for individuals affected by it. Those who are not color blind seem to have the misconception that color blindness means that a color blind person sees only in black and white or shades of gray. While this sort of condition is possible, it is extremely rare. Being color blind does keep one from performing certain jobs and makes others difficult. \n\nLife's minor frustrations (and occasional dangers) for the color blind:\nWeather forecasts - especially the Weather Channel - where certain colors just can not be distinguished on their weather maps. Also, maps in general because of the color coding on the legends. \nBi-color and tri-color LEDs (Light Emitting Diodes): Is that glowing indicator light red, yellow, or green? \nTraffic lights, and worst of all, Caution lights: Color blind people always know the position of the colors on the traffic light - in most states, Red on top, Yellow in the center, Green (or is that blue?) on the bottom. It isn't good when we go to a city or state where they put traffic lights horizontal - it takes a couple of days to get used to that one! But caution lights present an entirely different problem. In this situation there is only one light; no top or bottom, no right or left, just one light that is either red or yellow - but which is it? \nGetting in the sun with your girlfriend: So, you're out in the boat or on the beach with your girlfriend and soaking up the rays. But I can't tell until far too late if I'm getting red - or if she is. If I can tell it's red, by that time it's fire engine red and a painful sunburn is already present. \nColor observation by others: "Look at those lovely pink flowers on that shrub". My reply, looking at a greenish shrub "What flowers?" \nPurchasing clothing: I've got some really neat colors of clothes. Not everyone appreciates them like I do though; they seem to think the colors are strange. I just don't know why! \nKids and crayons: Color vision deficiencies bother affected children from the earliest years. At school, coloring can become a difficulty when one has to take the blue crayon -and not the pink one- to color the ocean. \nTest strips for hard water, pH, swimming pools, etc.: A color blind person is generally unable to : \ninterpret some chemical reactions \nsee that litmus paper turns red by acid \nidentify a material by the color of its flame such as lead blue or potassium purple \ninterpret the chemical testing kits for swimming pool water, test strips for hard water, soil or water pH tests - all of which rely on subtle color differences and a band of similar colors to compare against. \nCooking and foods: \nWhen cooking, red deficient individuals cannot tell whether their piece of meat is raw or well done. Many can not tell the difference between green and ripe tomatoes or between ketchup and chocolate syrup. \nSome food can even look definitely disgusting to color deficient individuals. For example, people with a green deficiency cannot possibly eat spinach which to them just look like cow pat. They can however distinguish some citrus fruits. Oranges seem to be of
710589
being color blind does not mean you see everything in black and white.  Most people with colorblindness have difficulty distinguishing between similar colors, ie.  blue and navy blue........blue and purple....orange and yellow..and so forth.  Rest assured, colorblind people can distinguish between the varying traffic lights, and they also get the full enjoyment that we get, when watching color television:)
739540
Many people say that bats are blind. This is not true, they use echolocation because nothing can see in the dark (light is how we see). Some bats even have better eye sight then humans. So next time someone uses the phrase "blind as a bat" you can tell them that means not very blind at all!
477703
The cat or the room?\nLight does not give us color. Our color was predetermined by our DNA. The light just potentiates or enhances what already is.
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Color blindness is a result of a defect in the cone receptors in the retinas of the eyes. Color blindness is a male dominant trait, but is carried by the female. One male in twenty suffers from some form of color blindness, but only one in several hundred females are color blind.\n\nColor blindness is the general term used by most people but maybe in this politically correct world we should refer to it as chromatically challenged. However in reality the symptoms range from an inability to see one color, or shades of one color, to a lack of ability to see any color at all. Because it is a result of a cone defect, colorblind people are also prone to night blindness, and may have extreme difficulty in seeing in low light, or their color perception may be greatly reduced in low light.\n\nWhat color blind people actually see is hard to explain or describe to one who isn't colorblind, and probably equally hard to determine by someone else. To get an idea of the degree of difficulty, try closing your eyes and describing the color green to someone who cannot see or who is totally color blind.\n\nDescribe it without using descriptors such as it is the color of grass, etc. With the exception of blue (which has become synonymous with cold) and red (which has become synonymous with hot) it is very difficult if not impossible to describe a color except in terms of things which are that color, or in terms of another color.\n\nRegardless of the level of color blindness involved, almost all those afflicted can see dark objects on a light background. They may see them as shades of gray but they can distinguish. As the level of intensity approaches equilibrium the ability to distinguish diminishes.\n\nBy equilibrium I mean that the intensity of the colors involved approach each other (the dark objects become lighter and the background becomes darker).\n\nThe most common color perception problems are with certain color combinations such as yellow on green, green on red, red on green, blue on red, red on blue, and red on black. This last is particularly annoying and dangerous, because it means that unless we are concentrating, those flashing little LED displays become almost invisible. I have almost no perception of LED displays unless I am up close, and the diode is very bright.\n\nBy contrast since color blind people don't see color the same way others do, we tend to come up with combinations that are offensive to others but may be neutral or even pleasing or to us.\n\nSome color blind people tend to gravitate to bright, vivid colors because they can be detected more easily. Muted colors or low intensity colors (text, lines or bands where there isn't enough color to register) cause difficulty or are indistinguishable.
65939
The eye has different types of receptors for color and brightness. The color receptors are sensitive to difference in the wavelength of light, much as the brightness receptors are sensitive to the difference in the brightness. \n\nDo you see green as everyone does? Not quite. There are some people who are color blind.\n\nFrom the wikipedia:\n\nPrimary colors are not a physical but rather a biological concept, based on the physiological response of the human eye to light. The human eye contains receptors called cones which normally respond to red, green, and blue light. Humans and other species with three such types of color receptors are known as trichromats. Although the peak responsivities of the cones do not occur exactly at the red, green and blue frequencies, those three colors are chosen as primary because they provide a wide gamut, making it possible to almost independently stimulate the three color receptors. To generate optimal color ranges for species other than humans, other additive primary colors would have to be used. For species known as tetrachromats with four different color receptors, one would use four primary colors. Many birds and marsupials are tetrachromats and it has been suggested that some female humans are born as tetrachromats as well, having an extra receptor for yellow. On the other hand, most mammals have only two types of color receptors and are therefore dichromats; to them, there are only two primary colors.
316343
I think that blind people would have their own ideas of what things 'look like' based on the things that are explained to them.  but while you cant explain color necessarily to a blind person, other things you can, and sound helps too. some blind people have very blurred vision and are still able to make shapes out. i believe that based on what they imagine things to be, thats what they dream. maybe just mostly shapes. just as we dont know what (a) god looks like, we all imagine and dream up something we belive him/her/it to look like, even though there is societal influence on the image in question. i think its somewhat ignorant to think that blind people dream in black and sound...
90653
Because psychologists have studied the specific neurons that fire in the brain when the color blue is present.  We can decipher from the data that everyone is not colorblind.
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.