Shhh, hummingbird drinking

I sat perfectly still and watched this wonderful creature pause long enough to take a good, deep drink. He and his friends returned again and again, and I never ceased to be amazed at how they flutter their wings. How many calories does a hummingbird burn a day, in Arizona?

I'm off on another short trip, this one to St. Gall in eastern Switzerland to learn about aging. Meanwhile, enjoy the Arizona bird!