Jack writes: "I took this photo of a male Rufous Hummingbird with my Nikon D5000. These little guys migrate over 2500 miles from across the Gulf of Mexico to Canada every year. He was gone the next day, probably in Canada by now."

This week's runner-up: by Brian Mork, Edwards AFB, California

Brian writes: "My wife and I were exploring the colors of the springtime desert west of Las Vegas when we discovered this agave flower standing about 18 feet high. I shot this picture in order to experiment with auto focusing against a distant, uniform background."

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