As legend has it, Dogs & Cats only see in black & white. Is there any new research indicating what colors domesticated animals actually see?
As I dimly recall, colour vision is thought to be mediated by the number of cones in the retina; this is different from black and white vision mediated by retinal rods. I think that this was the basis for the claim that animals couldn’t see colour. I have not seen any recent research, but in medical school one professor claimed that cats COULD likely see in colour, but dogs could not. I don’t know if this is true. Seeing eye birds were supposedly touted over dogs because they could see in colour. I don’t see what difference this makes myself; colourblind people know traffic lights by their location and different sizes.
Seeing-eye bird: Don’t drink that wine, you fool. You asked for red, dammit, not rose.
There are at least 5 threads, some last month, on that exact topic.
Just do your homework: Search on “color” in the subject line and “Any Date”