I know you are in Colorado and that you don't get ruby-throats. So I will take a wild guess I'm sure I am wrong but Blackchins? Sarah

I'm not sure Judi,
whatever they are they look like females,they certianly look big enough to be broadtails.
stephen

wow, look at that chunky monster on the right. I don't think I've ever seen a hummingbird that large. can't help on the ID, sorry, but thanks for the great pic.

Thanks for your comments. I'll try to get more pictures to share as the feeder is busy constantly from dawn to dusk. The problem is between me and my camera - good pics are few and far between.

What great little entertainers these birds are!

Broadtail HB's breed in CO, so most likely that is what you are seeing. Where are you in CO? I am in Denver.

I'm in Lakewood - Green Mountain area.