night vision: dreaming

5:31 am. A gibbous moon is high overhead. Frogs are making rubber-band sounds from the corner of Lily Lake. I am following a gravel path, using my ears as much as my eyes to guide me. The white-throated warbler decides that night is over, singing "O sweet Canada Canada Canada" at exactly 5:10 am. I wonder: do birds really see the subtle change in light? I don't notice any difference in the sky until 5:30 am, the first time I am able to successfully focus my camera lens. A robin launches into his cheery good morning song.