I'm loving the neighborhood bird whose songs imitate the well-known car-alarm sequence, augmented with police and fire sirens. I don't know the species of this bird — maybe a cat bird? — but it's definitely a jazz singer, improvising long solo jams on all the popular neighborhood racket. I think I even heard a jackhammer in the tweets the other morning. It's pretty amazing to hear those annoying sounds transformed into birdsong.
But I wish this bird would perform at a reasonable hour, not 4:30 am.