A hummingbird visit

Outside my office window today, I saw a female hummingbird hovering. She stayed quite a long time (at least for a hummingbird), moving around.

I think she saw her reflection, and was wondering 'who the heck was that?'

Ruby-throated hummingbirds are keenly defending their territories now, as they prepare to head south for the winter, and I suppose, wanting to load up on energy.