Cat and Dog Blog

How do scientists find the colors that an animal can see and, in general, what kind of vision that animals / birds?

For example, I read on Wiki that cat night vision than humans, but the day vision is inferior. In addition, a hen can see only a few specific colors (Not the entire spectrum). In addition, an eagle has a telescopic vision, etc. How are these things found? It may not be able to get the cats or chickens to respond to some specific colors, etc, I guess!

It is actually a combination of the first two posters wrote. Microscopic examination of the retina provides information on the density of visual cells and the proportions of a species. More rods than cones indicate a better night vision for example. Test Visal pigment cells in the retina of their responses to light determines the sensitivity of the wavelength of the different cell types, which sets how well an animal must be able to discriminate colors. Behavioral studies can establish the animal's ability to real life to discriminate between colors and seeing objects levels in different light. Cats have trouble seeing some of the colors that the normal human eye can see because they only have two types of cones to our 3. Chickens, as Most birds have cones with 4 different visual pigments, in addition to color filtering oil droplets and are capable of seeing colors many times more than we can, even in the ultraviolet range. Eagles actually have a vision of high definition, telescopic vision, because the well foveal area of ​​dense cells of the retina, creating a high-resolution image.