That's exactly what happens to bulls. They're colour blind and red does not matter to them.
Colour gamuts are exactly that: what can be printed. It is related to what you can see in a way
In colour matters, they describe vision for animals - among other things how bees beat us in ultraviolet (which is why a very white t-shirt will make them react like they found the Great Flower, until they realize it's just plain you).
For CMYK printing, four colours are needed. It does not mean all colours that exist CAN be printed. In the case of some real bright oranges, or deep blues, CMYK will fail. It's called "out of gamut" colours. In fact the issue with digital publishing is that monitors have a wider gamut, and therefore some colours that appear on your screen may not be available on paper.
Some animals see life like this because it helps them survive in their environment, like bees who can see ultraviolet, which we cannot see, and that helps them locate flowers. Keep in mind their eyes are not designed like ours, they have faceted, simple eye cells, we have two very complex eyes. Other animals can detect movement better, contrast (like a black and white photo shows contrast better than a colour picture), detect colours specific to their preys or predators, or simply have a better vision in the dark in general.
As for humans, it is assumed by the way that our own colour vision helped our gatherer ancestors to identify fruit, while it is today of vital importance to follow fashion and increase our mating opportunities. ;o)
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