Identifying immature hummers?

[Richard Trinkner]

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 

[eugene...@gmail.com]

I've had this same question and a lot of time at home lately to study and photograph our local hummers (which are only Broad-tailed and Rufous with the rare Calliope). Evidently the only sure way is to photograph (or hand-hold certified if you are a hummingbird bander) the bird to see its flared tail. Eye-ring feathers can be very helpful (white for Broad-tailed and buffy, brown or rufus on Rufous). Throat pattern might also help, especially with juvenile male vs female, but there is a lot of variability. Check out Sheri Williamson's Flickr page  https://www.flickr.com/photos/tzunun/galleries/with/72157628212647729  and web page  http://fieldguidetohummingbirds.com/