Silver Lake Ave Public Staircase: Red-Shouldered Hawk Expanding Territiory?

Photo: Diane Edwardson, September 8, 2015, 8:50 AM.  I'd never seen an adult Red-Shouldered Hawk this far south in the neighborhood:  on the Silver Lake Ave Public Staircase, between the Red Car Property and Lake View Ave.  (Click on photos to enlarge.)

Once again, songbirds alerted me to a nearby hawk.  They were giving a funky alarmed call that I did not recognize, as I walked up the public