I've read somewhere that they can see red...which is why they like tomatoes, raspberries, strawberries and each other's blood...
Someone did research and found out that Leghorns can see in colour. I don't remember if they tried it with other breeds.
I vote for "they see colors". How else can they see those itty bitty things in the dirt when I'm working in the garden and they just about take off my fingers to get to whatever it is.
when I deer hunt, I wear orange and the deer don't see it.
When I turkey hunt, I have to wear full body camouflage with no orange or even exposed skin.
Dogs see black and white, cats see some colors but built for night time hunting, ground hogs have bad vision and won't see you if you stand perfectly still.