[obol] Goldfinch question

[Peter Hoffman]

I have photos of American Goldfinches taken in my backyard in Beaverton about
six months apart.  Some have orange beaks and legs while others have black beak
and legs.  Are these different varieties or are the variations due to age or season?
Photos may be viewed at www.peterhoffman.homestead.com/question.html
I am new to birding and would appreciate your input.  Thanks.
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