When you want them to fly they won't, and when you want them to sit they don't.
Focussed on distant White-bellied Sea-Eagle (Haliaeetus leucogaster) in Tyto today with determined effort to get exposure spot on and then add 1.4x converter and see what changed. All locked up on tripod.
No reason for bird to take off, so of course it did.
Tried to follow by panning on ball and socket and failed miserably.
Had I been hand-holding camera and asking bird to fly there'd have been the standard 20-30 minutes of two lives on hold: and I always lose that game.