You may recall the recent photo of the Northern Hawk Owl coughing up the pellet ?
After doing so the owl sat perched for a short period….knowing full well at any moment he/she would take flight in search of a meal.
These owls give little to no indication when they are about to take off…you need to be focused and ready while watching for the slightest movement.
When take-off occurs…it’s hold the shutter down and cross your fingers you’ve picked the best possible spot from where to shoot.