I went looking for the Sharp–shinned Hawk again (the one I had misidentified two days ago as a Merlin). Alas, I did not find it.
But, a couple of other birds did fly by: a female Mallard and a adult Bald Eagle. The Mallard offered a lovely display of its speculum. The eagle was packing lunch: a pigeon. Oh yes, note that the Mallard is deploying its alulae.
What a great picture!