Getting birdy

I can't seem to walk outside these days without hearing a call note from a migratory bird species. If it's not a white-throated sparrow, it's a dark-eyed junco or some other songbird headed north. One day it was a yellow-rumped warbler, clinging to the side of The Salvation Army building a few blocks away. Sunday, it was a junco in the alley. One other notable sighting: a black-crowned night heron braving the mid-40s temperatures over Lake Shore Drive yesterday.