Those are some nice Card shots, John; we don't get those guys out on the left coast, here.
A couple of suggestions:
When you have as much light as you appear to have had there, dial your ISO back a stop or so, and open our aperture up an equivalent amount to compensate. This would give you a cleaner image where you wouldn't lose as much detail to noise and still give you plenty of DoF to capture the birds.
E.g
1/1000, f/11, ISO 1600 could just as easily have been 1/1000, f/8, ISO 800, or 1/1000, f/5.6, ISO 400.
Due to general light constraints when shooting birds, I usually stay at either f/5.6 or f/8, occasionally and adjust the other two settings around that.
NA's right; the 7D is not a straight out of the box shooter to get the best results, mostly. Have you watched the video series on it over at B&H yet? If not, I highly recommend doing so, for some good tips/tricks with it.