i believe these are Song Sparrows, common throughout the US and Canada. they are very variable so the birds markings don't exactly match any of the recognition pictures i have, but they are close.
http://users.bestweb.net/~hchong/temp/ taken on the *istD with a Sigma 50-500 and Sigma 2X extender at 500mm wide open and then cropped to the 50% center portion. equivalent FOV to a 1500mm lens on a 35mm film body. Herb...
