Thanks guys. Yes, I have dusty sensors. I usually clean them before going anywhere, but this past weekend was a real spur of the moment trip, so no cleaning. I've got a lot of shots that show dust, one body showed even at f/7. When I see dust at f/7, it's time to clean.
They certainly aren't the prettiest birds, but you have to admit that when you see a decent shots of the wings, both top and underneath, they are pretty cool. The color on top with a full wing spread is really nice. I kept trying to catch them banking, hoping to get a top-shot, but I didn't get very many.