I have often heard the coloration of the robin’s breast described as red. In Peterson’s field guide he describes it as a “brick red.” It is not red like the flaming red crest of a pileated woodpecker, for example. The robin’s breast is more orange, which as we know, is a color we can create by mixing red and yellow pigments together. So, on the color wheel, the robin’s red breast is more in the secondary color yellow-red (orange) range not the pure primary red.
In this photo you can see that the robin’s breast matches and blends in well with the warm oranges and browns of the fall leaves.
Honestly, I’m okay with calling it red. It’s easier to write catchy songs like “When the Red, Red Robin Comes Bob, Bob, Bobbin' Along.” I need a little spring in my step as I walk around in the chilly days of the coming winter.