Never really got an explanation of what this behavior is all about. Seems to be a lot of it going on now so I am wondering if it has anything to do with the coming departure of the colony.
At any rate , it is fun to watch and great practice for flight photography.
800ISO f6.3 at 1/4000th spot metered off grass
80/400 at 400mm on a Nikon D4
Nice image Joe, you've got those whites spot on. I still struggle a wee bit with them. I like the position of the birds between the clouds on a lovely BG. Well done