It takes a lot of energy to hover like this, but a diet of pure liquid sugar, similar to that of many Americans, provides the necessary fuel. The difference is that these birds burn it off, while the ground-creaking Americanus Obeseius, about 1/3rd of the current population, stores it for use in causing diabetes and heart attacks.
In repose this tiny bird was not very noticeable, and apart from the long beak was rather dull to look at. The two commonest species in Oregon are Anna's Hummingbird and the Rufous Hummingbird. I think this was the latter, but not in full color plumage, possibly a juvenile or female.
Briefly it hung around the willow in the creek, and here's a photo for size comparison. The other bird is a Song Sparrow, of which there are over 30 recognised subspecies. A hummingbird weighs about the same as three small paperclips.
Ghost wanted to get more involved, but the bird was sensibly staying at the tops of the trees. The action of the hummingbird closely mimicked his favorite toy, a bundle of feathers tied to a stick with a length of elastic.