Are animals colour blind?

Question

I heard that cats and dogs are....it this true?

Answer 1

Dogs and cats arent necessarily color blind per se. The have a dichromatic color vision that is similar to that of a human with red-green color-blindness

The Journal of the Veterinary Medical Association described that there is a fundamental design difference between canine/feline vision and that of humans. Human vision is optimized for seeing in bright light, while dogs, like many other predators, see best in dimmer light and darkness.

There are two types of photoreceptor cells in the retina of the eye, namely rods and cones that respond to light and transmit electric impulses to the optic nerve through a series of chemical reactions. Rods process visual information in dim light and are sensitive motion detectors, while cones handle color and detail. The human retina contains approximately 100 million rods and 7 million cones. In contrast, cone cells contain pigments that perceive specific wavelengths of color. Human vision is trichromatic -- we have three types of cones that recognize different portions of the color spectrum. These cones allow us to see a range of colors that are a mix of red, blue, and green pigments. Dogs and cats have only two types of cones, and their dichromatic color vision is similar to that of a human with red-green color-blindness. In addition, a dog's retina contains a much smaller ratio of cones to rods than ours does.

Night vision in dogs and cats is far superior. They have a reflective structure behind their retina called the tapetum lucidum, and see objects in the dark as if lit by an eerie glow.

Answer 2

Cats and dogs see in black and white. Place a fluorescent orange ball on a rug. Let the dog try to find it they will walk past it most times until the get the scent.

Answer 3

In Spain I was told bulls cannot distinguish colours, they just get upset when someone is waving something in front of them (of any colour, not just red!). Dogs I know they also see in black and white.

Answer 4

Only ones I have heard of are dogs.

Answer 5

i'm shade blind. i replaced into instructed that once i replaced into 9 years old, yet at college they instructed me i could no longer be shade blind as i'm lady, yet I actual am as proved by ability of my optician. i don't be attentive to approximately what animals won't have the capacity to work out pink yet i won't have the capacity to and that i assume i'm a minimum of Mamal if no longer animal.

Answer 6

Cats aren't.
http://www.madsci.org/posts/archives/aug98/903122934.Zo.r.html
Dogs are.
http://vision.about.com/od/severevisionloss/f/guidedog.htm

Answer 7

i know dogs are but i dont kno if cats are

Answer 8

They say that certain animals are but i dont think they could ever really know.

Answer 9

Even if it is true, there is NO way to prove it..