A spectrum of color vision exists across mammals. There are four main categories that mammals’ color vision falls into.

• Excellent trichromatic vision-- present in diurnal primates (eg: humans and rhesus monkeys).
• Robust dichromatic vision-- present in species with two cone types and many cones (eg: dogs and pigs)
• Feeble dichromatic color vision-- present in species with two cone types and few cones (eg: house cats)
• Minimal color vision-- present in species with one cone type (eg: owls and raccoons)