Female Rufous Hummingbird. She spends most of her time being chased by "Rusty" the male Rufous who is king of the feeder closest to the house.
I'm not sure who this one is of the 5 Rufous that frequent the feeders. We also have several Costa's, a few Black Chinned, and an occasional visit from a Magnificent and one as yet unidentified. There is constant motion outside the window.
Rusty is outside the window protecting more nectar than he could consume in a life time but he's not one to share although others do get past him. He has been very elusive when I have the camera as he is constantly chasing someone.
This is "Rocky" a Costa's who was king until Rusty moved in and took over. Rocky still chases other hummers and does battle but more often than not just waits until Rusty is otherwise engaged before feeding.