Thoreau's Journal: 16-May-1858
A hummingbird yesterday came into the next house and was caught. Flew about our parlor to-day and tasted Sophia’s flowers. In some lights you saw none of the colors of its throat. In others, in the shade the throat was clear bright scarlet, but in the sun it glowed with splendid metallic, fiery reflections about the neck and throat. It uttered from time to time, as it flew, a faint squeaking chirp or chirrup. The hum sounded more hollow when it approached a flower. Its wings fanned the air so forcibly that you felt the cool wind they raised a foot off, and nearer it was very remarkable. Does not this very motion of the wings keep a bird cool in hot weather?