A neighbor has citrus trees growing in his front yard next to the sidewalk and told me I can have the fruit if I wish. One is some type of regular orange, fairly thin-skinned, quite sweet and juicy. In season I'll often grab one for breakfast.
He also has what he called a blood orange. The fruit is pretty small, not sweet, and not juicy. Not one of my favorites at all. They are certainly not red either, a light blush at best. I read that they change to a red color if they get cold. Even when it got close to freezing I never really saw what I'd call red. I stick to his regular orange.