Thank you Ivar, I am lucky to come from a family of knowledgeable birders.
Shutter speed to me is most critical in birding, however I am a Nikonian and can't tell you much about Canon, but I imagine the same principles apply for the most part. I usually shoot in auto-mode, but when I don't it is usually because I am shooting hummingbirds, or other fast-moving birds and need to slow the shot down more. I will max-out my shutter-speed in the manual setting in those situation's, only on sunny day's with good light. That said I do have image stabilization on all my lenses and rarely use a monopod or tripod unless shooting longer-distance's. This image was taken on a low-light day at 1/800 shutter speed, f7.1, ISO 200. Bracketing capability I have found to be a great advantage when shooting birds as well.