The autumn hawk migration has begun around here. It's a wonderful phenomenon.
I had a Red-Shouldered (as in photo) high overhead this morning, but on the hills in September you can find "kettles" of Broad Wings - possibly our most commonly-seen fall migrant hawk on the Atlantic Flyway, circling as they ride the morning thermals up to catch a long free, coasting ride south until they reach the next thermal updraft.
The identification of raptors is difficult, and I have no skill at it but I have a couple of pals who are. Like so many things, you have to learn from an expert: a book is almost useless because hawks are almost always seen in flight and, during migration, usually at fairly high altitudes so you only have a profile and, perhaps, a flight style. Furthermore, many migrants are immature first-year birds without the mature plumage.
The species pass by in phases. In late October and November come the most interesting ones: rugged birds like eagles, Goshawks, and Rough Leggeds.
I easily identified my passing Red Shouldered because of the "windows" in his wings.
(Speaking of migration, I have seen almost no migrating Monarch butterflies this year. In fact, far fewer butterflies in the gardens all summer than usual. Missed them because, in my view, butterflies, bees, and hummingbirds are part of the vitality and fun of gardens.)