This is one of the two green swallows found in British Columbia for the summer. The second is a Tree Swallow. There are three distinct features that separate the two birds with two visible here in this picture. The first is the white on the face extends up and over the eye where as the white stays below the eye in the Tree swallow. Secondly, the color of the back is more a metallic forest green while the tree swallow is a metallic blue-green. This was taken just south of Okanagan Falls below Peach Cliff.