Robins are so widespread that most of us haven't noticed, but Cornell's Lab of Ornithology has. In a 40-year study they proved that the center of the robin population is now in southern Kansas. The center 40 years ago was north of Gainesville - on the banks of the Red River.
PIGEONS AND DOVES ARE BIRDS OF A FEATHER. They're pretty much the same; both members of the Columbida family. But the label "dove" implies a more refined, better mannered and less germy bird. Doves are also more slender. In common usage, the farther the bird is removed, genetically, from the pigeons we've all seen in parking lots, around dumpsters and on street lights, the more apt it is to be called a "dove".
Ages and ages ago, the wild pigeon was primarily dark blue and/or dark gray. Much of this coloration has been "bred away" in doves - the Mourning Dove, for example, is beige and light gray.