Here, for example, is a female red winged blackbird that I saw, off and on, with a flock of males all winter long. This photo was taken on January 12th:
Then there were the cowbirds. I had several of those visiting fairly regularly all through the winter too. This photo, of a brown-headed cowbird male feeding with 2 red winged blackbirds, an immature white crowned sparrow and a female cardinal, was taken on January 13th.
I didn't get a photo of the last major migratory anomaly that I noted: a single common grackle that also flocked with the red winged blackbirds at my feeders for much of the winter.
About a week ago, the grackles started coming through in large numbers, still mixed in with flocks of red-winged blackbirds. I'm hearing killdeer call, so I know that their migration has started too. I'm going to have to research a little further and see what, if anything, my oddball winter residents can teach me.