On Saturday, 11/8, during the lunar eclipse, I noticed some odd illuminated lights in the sky (see entry from 11/9). A few days ago, while walking down the street during daylight, I discovered that what I had seen were flocks of migrating birds. These suckers were flying very high (several thousand feet) and the ones I saw that night must have been illuminated by the light from the city below.

So that's what I saw- riddle solved. They were quite a spectacle.