Bluejay
This pair of birds landed in the hackberry tree for just a few seconds, then proceeded to dart in and out among the limbs of that tree and a nearby catalpa and pecan tree at breakneck speed! I am astonished that they can fly that fast in such close quarters without crashing!
Dead Creek Wildlife Area
These are a little rare in the Glen Canyon area, but they stand out so they are easier to find.
These are funny birds that are everywhere. Come to think of it, a lot of the animals and plants in San Francisco are everywhere...