This morning an apparent male-female pair of White-winged Doves was engaged in close courtship behavior about 150 meters northeast of the intersection of White Rock and Spine in the Gunbarrel area of Boulder. About 30 minutes later I heard a White-winged Dove at the southwest corner of Gunbarrel Commons Park, about four blocks away as the dove flies. I can't prove it was a third bird, but that was my impression.
This species may be starting a permanent colonization of the area.
Nathan Pieplow
Boulder