This girl caught me quite unprepared and I did virtually everything wrong but still got a few half decent shots.
600 was too much, one of the few times I can say that.
6D 300 X2 640th F7.1 ISO 640
For me, for a bird of that size, it would have been The First time 600 was too much
5DIII, 1DX, 7DII, 8-15/4L, 16-35 f4L IS, 24-70/2.8L II, 70-200/2.8L IS II, 200-400/4L IS 1.4x, Zeiss 15/2.8, 17/4L TS-E, 24/3.5L TS-E II, Zeiss 35/1.4, Zeiss Otus 55/1.4, Zeiss Otus 85/1.4, 100/2.8L IS Macro, Zeiss 135/2, 600/4L IS II