On the upper level the sparrows were eating seeds and one sparrow was collecting feathers. This is too early for nesting. Maybe this sparrow is working on an insulation project.
By the underpass tunnel from upper level to lower level there is a reflector, good to prevent collisions between bikes and joggers.
Also very handy for a self portrait. Dressing like an eskimo is a good idea when it's 17 degrees.
No further work has been done on this shabby, throw-together nest. While studying this work-in-progress I saw one of the hawks fly over. I got my usual rotten flight picture. The hawk then circled buildings on Riverside Drive and West End Avenue before heading North. I didn't hang around waiting to see if any construction would take place. It was too cold.