Nocturnal animals like owls have greater density of rods in their retina . The rods are responsible for vision in dark. Therefore they see better at night. Owls also have tubular eyes that increase the throw from the lens to the retina. Back To Top 2 .
Dogs have very poor color vision.
So they see in shades of grey, just like a black and white television. Butterflies have compound eyes like many other insects. They see better than humans in ultraviolet range upto 300 nm. They require this ability to spot the central nectar bearing part of the flower. This helps the plant in pollination.