582
Cats can not see red, but are able to distinguish 25 shades of gray
Cats as well as humans, have two types of photosensitive cells (rods and cones). But if one per flask in sharpest 4 sticks of falls, then their cats Cats worse 25. We see the color red, for example, they can not at all, unlike blue. But in the field of "vision" shades of gray cat - real champions: they are able to distinguish between 25 types of mouse color. So for cats "day and night all around the gray».
via factroom.ru