Cats are not completely colorblind, but they don't see exactly the same colors as people. No one is really 100% sure (it's sort of hard to get a cat to tell you whether it can see aquamarine or not). However, it is believed that they see the world as shades of blue and yellow. The reasons cats don't need to see the same colors as people is because colors are an evolutionary device to let you see stationary objects standing out from a stationary background. Cat's eyes aren't designed for this - they're designed to see motion. They are very good at this, noticing little movements that a human may not (that's why you'll often see them staring at something in a corner somewhere and find a bug there).
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