Uhm, this "fact" is fiction, more likely. Because, let's face it, *all* birds have far better color sight than humans. It is rather well-known that humans possess cells to see three different colors,namely red, green and blue. All other colors are seen as a mix of the three above. (That's why our TV and PC monitors are based on those three colors.)
Most birds, on the other hand, possess four different cone cells for color sight, one each for red, green, blue and UV. Additionally, birds have the benefit that they have droplets of oil in their cone cells (responsible for seeing color) that filter the light, enhancing the birds' ability to discern between small nuances of color.
(Although it is very likely that nocturnal birds like owls don't possess all four kinds of cone cells. Pigeons, on the other hand, are believed to be pentachromates, using five different kinds of cone cells for discerning colors.)
