I seem to remember from biology lessons at school that cats don't see in colour the same as we do. The retina is made up of rods and cones which are sensitive to different things. The cat's retina contains many more rods than cones and it is the cones that see colour. The more rods, coupled with their ability to open their irises to the extreme, enable them to see in the dark so much better than we can.
Something like that anyway! :-?
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