[ASA Vet]

Interesting topic.

What predators other than other colour-sighted dinosaurs (assuming they like their bird ancestors were color-sighted,)
preyed on adult dinosaurs?

Not directly related as they weren't around yet but
Canines are not colour-sighted, how about felines?

[King Prout]

IIRC, felines have limited color vision and excellent BW vision.

I don't know about the vision of arboreal snakes.

Bear in mind that camouflage is as important for hunters as it is for prey. perhaps more so.

Bear in mind also that I am addressing the earliest advantages of the earliest adaptation of scales into fringed (slightly feather-like) scales, that I am NOT addressing the varied uses of much later adaptation of fully-developed avian feathers into flights, plumage, and sexual display exaggerations.

[muawiyah]

Hey, as long as you got one type of rod and one type of cone, which respond to a different range of light frequencies, you have all you need for "color" vision.

The problem arises in differentiating between two colors of similar frequency, accounting for intensity, etc.