This image of the Australian Kestrel was taken some years ago on film stock. I've included it here as Randy wished to see my hide/tower set-up and the tower seen here was set up on this nesting kestrel.
Of course the tower is introduced in stages over 5-6 days before photography commenced, but even on the first day the 2 kestrels went about feeding their young regardless of our presence below unloading the tower..!!
EOS 5, 100-300 F5.6L, iso 100, 1/125 @ F11, early morning light with fill flash. Tower/hide, tripod.