wdross wrote:
I would guess an immature Rufous Hummingbird. It looks like it is just coming into its adult plumage. They tend to be more aggressive than Broadtails and Ruby Throated and will chase other hummers away from "their" hummingbird feeder. They are the most fearless animal pound for pound. Of course, they don't even come close to a pound.
You are with the majority. I didn't think of the Rufous because I had never IDd one in my yard before.