‘Red gene’ in birds, turtles suggests dinosaurs had bird-like color vision

A gene for red colour vision that originated in the reptile lineage around 250 million years ago has resulted in the bright red bird feathers and ‘painted’ turtles we see today, and may be evidence that dinosaurs could see as many shades of red as birds, and perhaps even displayed more red than we might think.
Paleontology News — ScienceDaily