While I don't have a 7D, the concepts are the same (with my 5D3). As mentioned by others, Aperture priority, and a reasonable ISO, plus exposure compensation (if the object is seen against a bright sky).
For me, for birding, I use ISO 400, Av, AI Servo, Spot metering, spot or grouped focus points (depends if the bird is in a tree - lots of clutter, or in clear view), max FPS (6 on the 5D3). And if possible, I stop the lens down half to a full stop, to increase the DOF. Plus it can help sharpen the image slightly. Exposure compensation varies from +1/3 stop (by default, I generally over expose slightly) to +1.5 stops in challenging light.
I wouldn't get too concerned about trying to keep a high shutter speed (although you haven't mentioned the lens you are using). Panning of fast moving objects is probably more important than the shutter speed, as a bit of blur can add to the image, IMHO.
Enjoy the picture taking