Juvenile Red-shouldered Hawk, with streaks on all of chest and underside; black tail with narrow white bands. It was calling extensively, with 5 or 6 repeated squeals each time, as it moved through thick stand of trees south of the sewage ponds. Eventually it silently flew into some dense, deciduous trees near NW sewage pond.
Pale crescent across outer primaries can be seen in photo of bird taking off. "All plumages show distinctive pale translucent crescent across outer primaries (by far the most important field mark to watch for on a flying bird)." - Sibley
