But that's only because I'm in preschool as a birder -- or infancy. I was at the Sacramento NWR Sunday morning, in pea soup fog. Almost passed up the main spot where you can get out of your car, as the closer birds (not very) are to the south, against the sun. But with the sky a softbox I decided to have a look. There wasn't anything of interest, but then I saw this little guy flitting around in the reeds between the road and the water. You can't go beyond a fence behind the reeds and the bird was mostly down behind them, very busy with short forays. (Bug hunting?) But every so often it gave me a reasonably clear view and then it unexpectedly landed on a fence post closer to me. For about three seconds.
Canon 7D2, 100-400 at 400, ISO 1600, f/6.3, 1/1250, handheld. Cropped to 30% of the original frame, not exactly the greatest IQ but I was pleased with the sharpness for this much crop. Headed to the car for the 600 after this and it flew off into the distance.
What is it?? I've never seen one like it (which means nothing).