Sunrise 7:25: Chirps in the dark

One of the things that the female Dawn Jogger thought would be absent in the newly-dark March was bird sounds, so delightful in the light of spring. But she was surprised to hear them chirping and singing away long before sunrise. Arent't they confused to be plunged suddenly back into winter darkness just as the nest building is getting done in earnest? The sun's first blush could be seen by the San Mateo Drive bike bridge...