Do the birds still see colors like the green on a mallard and the blue on its wings?
They see all of the wavelengths that we see, but those colors look different to birds because their eye and brain structures are different. This is true for both UV reflective colors and non UV reflective colors. Bird cones (the color receptors on their retinas) are not sensitive to the same wavelengths as humans. Bird cones are also more sensitive in blue, violets, and UV. These facts along with brain structure differences (and some other cool things) make their vision system so different that they see colors in a much more sophisticated way than we can imagine because it is not within the realm of our sensory experience.
