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The color of a cats' eyes – as well as its skin and fur – is determined by the amount of melanin it has in its genetic makeup. The more melanin a cat has, the more intense its eye color will be, and cats with low levels of melanin tend to have blue eyes; white cats with blue eyes are also likely to be deaf. Pedigree cats tend to have much more intense eye coloring than common moggies, but moggies are more likely to have attractive mixed tones in their eyes. Yellow is the most common color for cats' eyes, while the rarest colors are orange and hazel. And of course some cats have heterochromia; that is, two different colored eyes, caused by a genetic mutation blocking pigmentation to one iris. (Image credit: Getty Images)What do cats' eye shapes mean?On a basic level, the shape of your cat's pupils is determined by how much light is around. In bright sunlight a cat's pupils will close to a thin vertical slit, while in the dark they'll open wide; in both cases this gives them the best vision. However, the shape of your cats eyes can also be indicative of its mood:What does it mean when my cats' pupils are big? Big, dilated pupils are usually the sign of an excited cat, which can be a positive or a negative thing. It could be surprised or happy to see you, or it might be frightened; by taking in your cat's current situation and reading the rest of its body language you should be able to tell what sort of mood it's in. What does it mean when my cats' pupils are small? Conversely, thin, constricted pupils are usually indicative of a relaxed cat, and that's generally a good sign. But for a more detailed run-down of how to judge your cat's mood using the state of its eyes and more, see our guide to cat body language.
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