http://www.npwrc.usgs.gov/resource/birds/upland/pheasant.htm
"These two roosters were both taken on October 10, 1992 — opening day of pheasant season last fall — within a mile of each other. Both are young-of-the-year birds. The bottom is obviously a juvenile. The top bird is fully colored. To tell whether the top bird is an adult or juvenile, you need to check the length and apperance of the spurs."