Hi! I'm working on improving my bird photography skills, and one of the things I have the hardest time with is getting in-focus shots of birds in flight. I realize that there will be a relatively low percentage of 'keepers' in the best of situations, but I am trying to improve my personal ratio on that front. My usual equipment is an EOS 7D with grip and EF 100-400 f/4.5-5.6L. I've found that using AI Servo and having all 19 AF points active (Auto-select) requires me to get a single focus point on the subject and then focus before it will track the subject. This can be difficult for me with fast moving or fast maneuvering birds. I recently found that I get more a greater percentage of in-focus shots in AI Servo mode by selecting Zone focusing, and using the "center 9" zone. This does not require that I get a fast-moving bird (often small, as we know...) in a single AF point and hoping I can track it well enough so that the AF system can lock onto it with that single AF point, though it does require I keep the subject inside that 'center 9'. (I also get better results with slower- moving birds like Herons instead of swallows, but I suppose that's relatively normal!) I have back-button focus enabled (I often wonder if this is the right setting for capturing moving subjects...), the Multi-controller (joystick) set to change the focus point/zone selection, AI Servo tracking sensitivity (C.Fn III-1) set to slow, AI Servo 1st/2nd image priority (C.Fn III-2) set to 0: AF/Tracking priority, and AI Servo AF tracking Method (C.Fn III-3) set to 1: Continuous AF Track Priority. I know I've got a long way to go learning to physically track the birds, and maintain a steady sight on them. I am hoping that maybe someone can point out anything I might be doing wrong with the camera settings, or recommend a different set of settings that may help me at my current skill level. Thanks!