For a Golden-crowned Kinglet, migration is tiring!
While keeping my distance, I was able to record its behavior. It doesn't seem bothered by me being nearby. I've never seen a bird like this in my yard before, so I had to do some sleuthing. I found that the bird was an adult male Golden-crowned Kinglet.
Apparently these little birds cannot go a few hours without food or it will starve. This may be why they are more focused on foraging than flying! This little guy was probably tired from migrating, and needed a snack.
The golden-crowned kinglet forages actively in trees or shrubs, mainly eating insects, insect eggs and spiders. It produces a series of high-pitched calls on a single note, and tends not to fear human approach. Its nest is a well-concealed hanging cup suspended from a conifer branch. [gbif.com]
Sources: