I have one hummingbird feeder in the backyard. A male Ruby-throated Hummingbird has been almost the sole visitor for several weeks. When he appears, the female hummingbirds keep away. He makes sure of that, first looking right.
Then checking out the photographer.
Then looking left.
When feeding he flies up and down, constantly watching. I would think he could be wasting a lot of energy that way, but he doesn’t mind.
Last week I took the feeder apart for cleaning and refill. The male bird showed up as I was doing that, and promptly flew away, angry perhaps. He has not been back since.
Two female Ruby-throated Hummingbirds have now replaced the male. However, one of them will inevitably chase away the other when she sees her. She dives toward the intruder so quickly that I haven’t been able to take a picture of that yet.
The female bird is very dainty, almost like a fashion model.
In flight, she looks just as nice as the male, even without those rubies on her throat.
Update: one more photo of the bird which flew away too fast, leaving only a blurry image looking like a painting.