Totally agree with the above, getting close and knowing your subject and its behaviour/patterns will go such a long way, short bursts of say 10-15 shots then maybe recompose should stand you in good stead...
This LEO had been studied for a couple weeks, learned and observed where and when it hunted and its habits which included landing on this perch every evening of only for a matter of seconds/minutes....
knowedge, field craft and a hefty bit of luck paid a huge part, also the use of a pop up dome hide was essential for capturing this image