They are! My husband and I figure, maybe, all the exercise they get from chasing each other around gets them ready for that long migration coming up at the end of the month.
This little guy has picked the nail I hang suet on in the winter for his perch to ward off offending others from the feeder he wants to claim as his. But upon returning to his nail he spots a wasp and puts on the brakes.
I may try using my D850 this afternoon and see what type of results I get. The ISO at 6400 is just my preference and where they seem to come out best for me. Most of my photos don't get cropped to much because I am no more than 10 feet from most of the birds when I take their photo.
My shutter speed depends a lot on how much light I have. If I have a lot of light I go to 4000 and above. I don't like my ISO going over the 6400 mark since my photos tend to get to grainy after that. I generally don't like them at feeders either. This is a feeder my son gave me at Christmas...