I've been cheating

I dont realy know, I've only just started trying this, at present I reckon its about 1 in 50, but that will improve as I get better at it, half the battle is knowing the subject and watching for when theyre about to take off etc, and I've to master that yet.

This one decided to approach a feeder but realised the bird already there wasn't going to move, hence the "hovering"