These comments have not been peer-reviewed, and do not represent the opinions of the U.S. Government. They are presented here as original work of the contributors.

cerulean@oneimage.com (D.W. KING) sent this comment:

The Glaucous Gull is found more regularly in winter in Colorado than the CBC Map depicts. Here is a 5-year pattern:

All these birds were found at big reservoirs on the plains of Colorado.