The Band-tailed Pigeon (BTPI) is about 14 in. long. When you first see the BTPIs, they tend to resemble some of the darker rock doves, or city pigeons. Distant flocks distinguished from rock doves by uniform appearance.
The Rock Pigeon (ROPI), formerly called Rock Dove, is better known as the common city pigeon is 12-14" long. It is believed this was the first bird to be domesticated, about 4500 B.C..