Black Skimmers are some of my favorite birds to photograph as they are fishing and skimming along the water. This group was working an area in the channel along the Wildlife Drive near the entrance to the Wildlife Drive at the Edwin B. Forsythe National Wildlife Refuge, Brigantine Division. I was shooting @ 600mm, but they were covering a large area, going down one of the channels moving away from me, then turning around coming back to me and going to the right. Then they would repeat their pattern. Time after time fishing the channels and then swinging around to skim along the other direction. There were 2 groups of 2 fishing there. In another post I will show images of the 2 skimming together.
I was using a Canon R with a Tamron 150-600mm lens and was surprised the Canon R tracked them so well. I even tried a few with a 2x teleconverter and still auto-focused well.