[cobirds] Identifying immature hummers?

Hi folks,

I would greatly appreciate anybody's explanation of how to identify immature hummingbirds in our area.  In particular, I'd like to learn how to separate immature Broad-tailed and Rufous Hummingbirds.  I've studied Sibley and browsed the web, but can't find much to help me feel confident.

Thanks!

Richard Trinkner

Boulder 

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