DOVES

Basically, there is no difference between doves and pigeons. According to John Tveten, "For the most part, however, "pigeon" is used for the larger species; "dove," for the smaller.  All have plump, muscular bodies and small, rounded heads that bob back and forth as they walk. Strong fast fliers, the larger species are popular as game birds.."

Inca Dove (Seen in The Woodlands, TX)
The Inca Dove is only 8 inches long (less than 2 ounces!). His feathers have dark edges, making them look like scales.  Originally found in the Rio Grande/south Texas areas, this bird has moved as far north as Austin. 
Mourning Dove (Seen in The Woodlands, TX)
   
Common Ground Dove
Common Ground Dove - This is a tiny dove (6"), that looks a bit like an Inca dove in the front, and a mourning dove in back! He lives in South Texas, in the brushy rangeland area.
White-tipped Dove
White-tipped Dove - About the size of a mourning dove, this bird can be found nowhere else in the U.S. (lower Rio Grande Valley to Argentina). He's very shy and hard to photograph.
White-winged Dove (Seen in The Woodlands, TX)
White-winged Dove - There used to be several million in the lower Rio Grande around 1900, but with the clearing of land and hunting contests to see who could kill the most, their population declined.

This bird is found in the southern part of Texas.  It looks like a mourning dove, but has large white wing patches, and a shorter tail with white edges.