Aging. (ageing)

Fox Sparrow winter adult: 
FOSP first fall.  Almost chocolate red and (remnant juvenile)  dusky edging to back: 

Common Loon:  
juvenile showing white edged scalloped back:

first fall showing some juvenile color: outer scapular line; rufous still on head;
streaked under: (juveniles molt before migration)
Here with adult winter that shows the dun color:

Bill Rudden
St. Louis
The Audubon Society of Missouri's Wild Bird Discussion Forum
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