I think my challenges are:
Camera settings
AF technique
Tracking fast-moving (sets of) terns
Challenge 1
Focus right on bird, blurry images.
Challenge 2
Tern flies in, AF on tern, blurry result.
Challenge 3
Tern hovering in canopy, AF on tern, blurry images.
Challenge 4
Small group of terns, some in focus, some not.
Challenge 5
Coming in (sometimes fast) over the trees.
Challenge 6
Against blue sky: no problems with Canon 80D 9-point focus, but R5 often cannot find focus point.
Challenge 7
“Hovering” terns in tree canopy.
Challenge 8
Terns flying straight in towards camera.
Challenge 9
Cannot get focus on stationary terns.